diff --git a/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java b/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java
index 5b07b03b7d..8874dbca34 100644
--- a/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java
+++ b/src/main/java/org/alfresco/repo/content/transform/TransformerDebug.java
@@ -1556,9 +1556,8 @@ public class TransformerDebug implements ApplicationContextAware
         debug(getMimetypeExt(sourceMimetype)+getMimetypeExt(targetMimetype) +
               ((fileName != null) ? fileName+' ' : "")+
               ((sourceSize >= 0) ? fileSize(sourceSize)+' ' : "") +
-              (renditionName != null ? "-- "+renditionName+" -- " : "") + " RenditionService2");
+              (renditionName != null ? "-- "+renditionName+" -- " : "") + " TransformService");
         debug(sourceNodeRef.toString() + ' ' +contentHashcode);
-        debug(" **a)  [01] TransformService");
         return pop(Call.AVAILABLE, true, false);
     }
 
diff --git a/src/main/java/org/alfresco/repo/rendition2/LegacySynchronousTransformClient.java b/src/main/java/org/alfresco/repo/rendition2/LegacySynchronousTransformClient.java
index c8a166dfab..23ea6cba3c 100644
--- a/src/main/java/org/alfresco/repo/rendition2/LegacySynchronousTransformClient.java
+++ b/src/main/java/org/alfresco/repo/rendition2/LegacySynchronousTransformClient.java
@@ -111,4 +111,10 @@ public class LegacySynchronousTransformClient extends ContentTransformServiceImp
             throw e;
         }
     }
+
+    @Override
+    public String getName()
+    {
+        return "Legacy";
+    }
 }
diff --git a/src/main/java/org/alfresco/repo/rendition2/LocalSynchronousTransformClient.java b/src/main/java/org/alfresco/repo/rendition2/LocalSynchronousTransformClient.java
index 3d2fdc95a5..e128b80808 100644
--- a/src/main/java/org/alfresco/repo/rendition2/LocalSynchronousTransformClient.java
+++ b/src/main/java/org/alfresco/repo/rendition2/LocalSynchronousTransformClient.java
@@ -140,4 +140,10 @@ public class LocalSynchronousTransformClient implements SynchronousTransformClie
             throw e;
         }
     }
+
+    @Override
+    public String getName()
+    {
+        return "Local";
+    }
 }
diff --git a/src/main/java/org/alfresco/repo/rendition2/SwitchingSynchronousTransformClient.java b/src/main/java/org/alfresco/repo/rendition2/SwitchingSynchronousTransformClient.java
index e15ba0c33b..2c19647731 100644
--- a/src/main/java/org/alfresco/repo/rendition2/SwitchingSynchronousTransformClient.java
+++ b/src/main/java/org/alfresco/repo/rendition2/SwitchingSynchronousTransformClient.java
@@ -64,18 +64,27 @@ public class SwitchingSynchronousTransformClient implements SynchronousTransform
     public boolean isSupported(String sourceMimetype, long sourceSizeInBytes, String contentUrl, String targetMimetype,
                                Map<String, String> actualOptions, String transformName, NodeRef sourceNodeRef)
     {
-        boolean supported =
-                primary.isSupported(sourceMimetype, sourceSizeInBytes, contentUrl, targetMimetype, actualOptions,
-                        transformName, sourceNodeRef) ||
-                secondary.isSupported(sourceMimetype, sourceSizeInBytes, contentUrl, targetMimetype, actualOptions,
-                        transformName, sourceNodeRef);
+        SynchronousTransformClient client = null;
+
+        if (primary.isSupported(sourceMimetype, sourceSizeInBytes, contentUrl, targetMimetype, actualOptions,
+                transformName, sourceNodeRef))
+        {
+            client = primary;
+        }
+        else if (secondary.isSupported(sourceMimetype, sourceSizeInBytes, contentUrl, targetMimetype, actualOptions,
+                transformName, sourceNodeRef))
+        {
+            client = secondary;
+        }
+
         if (transformerDebug.isEnabled())
         {
             String renditionName = TransformDefinition.convertToRenditionName(transformName);
             transformerDebug.debug(sourceMimetype, targetMimetype, sourceNodeRef, sourceSizeInBytes, renditionName,
-                    " is "+(supported ? "" : "not ")+"supported");
+                    "synchronous transform is "+
+                            (client == null ? "NOT supported" : "supported by "+client.getName()));
         }
-        return supported;
+        return client != null;
     }
 
     @Override
@@ -98,4 +107,11 @@ public class SwitchingSynchronousTransformClient implements SynchronousTransform
             }
         }
     }
+
+    @Override
+    public String getName()
+    {
+        // If we start nesting SwitchingSynchronousTransformClients, we will need to get the current client from a ThreadLocal
+        throw new UnsupportedOperationException("SwitchingSynchronousTransformClients cannot be nested");
+    }
 }
diff --git a/src/main/java/org/alfresco/repo/rendition2/SynchronousTransformClient.java b/src/main/java/org/alfresco/repo/rendition2/SynchronousTransformClient.java
index c0952af2fc..c91a501ea5 100644
--- a/src/main/java/org/alfresco/repo/rendition2/SynchronousTransformClient.java
+++ b/src/main/java/org/alfresco/repo/rendition2/SynchronousTransformClient.java
@@ -81,4 +81,9 @@ public interface SynchronousTransformClient
     void transform(ContentReader reader, ContentWriter writer, Map<String, String> actualOptions,
                    String transformName, NodeRef sourceNodeRef)
             throws UnsupportedTransformationException, ContentIOException;
+
+    /**
+     * @return type of transform (Local, Legacy) for use in debug.
+     */
+    String getName();
 }
diff --git a/src/test/java/org/alfresco/repo/thumbnail/ThumbnailServiceImplTest.java b/src/test/java/org/alfresco/repo/thumbnail/ThumbnailServiceImplTest.java
index 8ce6cd2eea..0f567ce18f 100644
--- a/src/test/java/org/alfresco/repo/thumbnail/ThumbnailServiceImplTest.java
+++ b/src/test/java/org/alfresco/repo/thumbnail/ThumbnailServiceImplTest.java
@@ -1568,6 +1568,12 @@ public class ThumbnailServiceImplTest extends BaseAlfrescoSpringTest
                 delegate.transform(reader, writer, actualOptions, transformName, sourceNodeRef);
             }
         }
+
+        @Override
+        public String getName()
+        {
+            return delegate.getName();
+        }
     }
 
     /**