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 8 (click to view)
MODELS:
WS-55517 / WS-65517 / WS-73517
CABINET DISASSEMBLY (REAR VIEW)
*Refer to the Parts List for Part Numbers
Rear Cabinet Disassembly
1. 2. 3. 4. 5. 6. Remove the Back Board by removing screws (a), and screws (b). Remove screws (c) to remove the Board Slide. Remove screws (d) to remove the Board Shelves. Remove screw (e) holding the chassis. Remove 4 screws (f) securing the Light Box Assembly. Be certain that all cables and connectors between the Light Box Assembly and external items are disconnected (e.g. speaker plugs, etc.), including the USB and 1394 connectors. 7. Slide the Light Box Assembly from the cabinet.