The Sony AV-3600 service manual was what I needed for the repair of this unit
Thanks for the good service
Dave
Text excerpt from page 3 (click to view)
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REPLACE THE BOTTOM PLATE
1 2 1 2
Bottom Plate
There is no serial label on the body as a service part. Therefore, you need to replace the customer's bottom plate with a serial label to the service part. The bottom plate can be removed by removing each two screws 1 and 2 on the bottom side.
A
Replace the customer's bottom plate to the service part.