diff --git a/engines/base/src/main/java/org/alfresco/transform/base/registry/TransformRegistry.java b/engines/base/src/main/java/org/alfresco/transform/base/registry/TransformRegistry.java
index 2aa05661..772098d9 100644
--- a/engines/base/src/main/java/org/alfresco/transform/base/registry/TransformRegistry.java
+++ b/engines/base/src/main/java/org/alfresco/transform/base/registry/TransformRegistry.java
@@ -360,15 +360,19 @@ public class TransformRegistry extends AbstractTransformRegistry
 
     public boolean checkSourceSize(String transformerName, String sourceMediaType, Long sourceSize, String targetMediaType)
     {
-        return Optional.ofNullable(getTransformer(transformerName)).
-                map(transformer -> transformer.getSupportedSourceAndTargetList().stream().
-                        filter(supported -> supported.getSourceMediaType().equals(sourceMediaType) &&
-                                            supported.getTargetMediaType().equals(targetMediaType)).
-                        findFirst().
-                        map(supported -> supported.getMaxSourceSizeBytes() == -1 ||
-                                         supported.getMaxSourceSizeBytes() >= sourceSize).
-                        orElse(false)).
-                orElse(false);
+        //TODO issue mentioned in ACS-3476,
+        //commenting out changes to code due to issues with libreoffice blocking a release
+        return true;
+
+//        return Optional.ofNullable(getTransformer(transformerName)).
+//                map(transformer -> transformer.getSupportedSourceAndTargetList().stream().
+//                        filter(supported -> supported.getSourceMediaType().equals(sourceMediaType) &&
+//                                            supported.getTargetMediaType().equals(targetMediaType)).
+//                        findFirst().
+//                        map(supported -> supported.getMaxSourceSizeBytes() == -1 ||
+//                                         supported.getMaxSourceSizeBytes() >= sourceSize).
+//                        orElse(false)).
+//                orElse(false);
     }
 
     public String getEngineName(String transformerName)
diff --git a/engines/base/src/test/java/org/alfresco/transform/base/fakes/AbstractFakeTransformEngine.java b/engines/base/src/test/java/org/alfresco/transform/base/fakes/AbstractFakeTransformEngine.java
index d6e01261..6e1cbdb3 100644
--- a/engines/base/src/test/java/org/alfresco/transform/base/fakes/AbstractFakeTransformEngine.java
+++ b/engines/base/src/test/java/org/alfresco/transform/base/fakes/AbstractFakeTransformEngine.java
@@ -27,18 +27,24 @@
 package org.alfresco.transform.base.fakes;
 
 import org.alfresco.transform.base.TransformEngine;
+import org.alfresco.transform.base.probes.ProbeTransform;
 import org.springframework.boot.test.context.TestComponent;
 
 /**
- * Subclass MUST be named FakeTransformEngineWith\<something>.
+ * Subclass MUST be named FakeTransformEngineWith\<something> otherwise the engine name will be "undefined".
  */
 @TestComponent
 public abstract class AbstractFakeTransformEngine implements TransformEngine
 {
+
+    private static final String FAKE_TRANSFORM_ENGINE_WITH = "FakeTransformEngineWith";
+
     @Override public String getTransformEngineName()
     {
         String simpleClassName = getClass().getSimpleName();
-        return "0000 "+simpleClassName.substring("FakeTransformEngineWith".length());
+        return simpleClassName.startsWith(FAKE_TRANSFORM_ENGINE_WITH)
+            ? "0000 "+simpleClassName.substring(FAKE_TRANSFORM_ENGINE_WITH.length())
+            : "undefined";
     }
 
     @Override public String getStartupMessage()
@@ -47,4 +53,10 @@ public abstract class AbstractFakeTransformEngine implements TransformEngine
                 "\nLine 2 "+getTransformEngineName()+
                 "\nLine 3";
     }
+
+    @Override
+    public ProbeTransform getProbeTransform()
+    {
+        return null;
+    }
 }
diff --git a/engines/base/src/test/java/org/alfresco/transform/base/registry/TransformRegistryTest.java b/engines/base/src/test/java/org/alfresco/transform/base/registry/TransformRegistryTest.java
index 208dc0da..b2af4f14 100644
--- a/engines/base/src/test/java/org/alfresco/transform/base/registry/TransformRegistryTest.java
+++ b/engines/base/src/test/java/org/alfresco/transform/base/registry/TransformRegistryTest.java
@@ -28,9 +28,12 @@ package org.alfresco.transform.base.registry;
 
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
+import com.google.common.collect.ImmutableSet;
+import org.alfresco.transform.base.fakes.AbstractFakeTransformEngine;
 import org.alfresco.transform.base.fakes.FakeTransformEngineWithAllInOne;
 import org.alfresco.transform.base.fakes.FakeTransformEngineWithOneCustomTransformer;
 import org.alfresco.transform.base.fakes.FakeTransformEngineWithTwoCustomTransformers;
+import org.alfresco.transform.config.SupportedSourceAndTarget;
 import org.alfresco.transform.config.TransformConfig;
 import org.alfresco.transform.config.Transformer;
 import org.junit.jupiter.api.AfterEach;
@@ -44,9 +47,13 @@ import java.util.Collections;
 import java.util.List;
 import java.util.stream.Collectors;
 
+import static org.alfresco.transform.common.Mimetype.MIMETYPE_EXCEL;
+import static org.alfresco.transform.common.Mimetype.MIMETYPE_PDF;
+import static org.alfresco.transform.common.Mimetype.MIMETYPE_WORD;
 import static org.junit.jupiter.api.Assertions.assertEquals;
 import static org.junit.jupiter.api.Assertions.assertFalse;
 import static org.junit.jupiter.api.Assertions.assertTrue;
+import static org.mockito.Mockito.doReturn;
 
 @AutoConfigureMockMvc
 @SpringBootTest(classes={org.alfresco.transform.base.Application.class})
@@ -227,4 +234,42 @@ public class TransformRegistryTest
 
         assertTrue(transformRegistry.isReadyForTransformRequests());
     }
+
+    @Test
+    public void testCheckSourceSize()
+    {
+        ReflectionTestUtils.setField(transformConfigFromTransformEngines, "transformEngines", ImmutableList.of(
+            new AbstractFakeTransformEngine()
+            {
+                @Override public TransformConfig getTransformConfig()
+                {
+                    return TransformConfig.builder()
+                        .withTransformers(ImmutableList.of(
+                            Transformer.builder()
+                                .withTransformerName("transformerName")
+                                .withSupportedSourceAndTargetList(ImmutableSet.of(
+                                    SupportedSourceAndTarget.builder()
+                                        .withSourceMediaType(MIMETYPE_WORD)
+                                        .withTargetMediaType(MIMETYPE_PDF)
+                                        .build(),
+                                    SupportedSourceAndTarget.builder()
+                                        .withSourceMediaType(MIMETYPE_EXCEL)
+                                        .withTargetMediaType(MIMETYPE_PDF)
+                                        .withMaxSourceSizeBytes(12345L)
+                                        .build()))
+                                .build()))
+                    .build();
+                }
+            }));
+        transformConfigFromTransformEngines.initTransformEngineConfig();
+        transformRegistry.retrieveConfig();
+
+        assertTrue( transformRegistry.checkSourceSize("transformerName", MIMETYPE_WORD, Long.MAX_VALUE, MIMETYPE_PDF));
+        assertTrue( transformRegistry.checkSourceSize("transformerName", MIMETYPE_EXCEL, 12345L, MIMETYPE_PDF));
+//TODO issue mentioned in ACS-3476,
+//commenting out changes to code due to issues with libreoffice blocking a release
+//        assertFalse(transformRegistry.checkSourceSize("transformerName", MIMETYPE_EXCEL, 12346L, MIMETYPE_PDF));
+//        assertFalse(transformRegistry.checkSourceSize("transformerName", "doesNotExist", 12345L, MIMETYPE_PDF));
+//        assertFalse(transformRegistry.checkSourceSize("doesNotExist", MIMETYPE_WORD, 12345L, MIMETYPE_PDF));
+    }
 }