Thanks you very much for this "hard to find" service manual.
Will help a lot in repairing this receiver.
Text excerpt from page 2 (click to view)
PDK-4002
2. EXPLODED VIEWS AND PARTS LIST
NOTES:
� Parts marked by "NSP" are generally unavailable because they are not in our Master Spare Parts List. � The mark found on some component parts indicates the importance of the safety factor of the part. Therefore, when replacing, be sure to use parts of identical designation. � Screws adjacent to mark on the product are used for disassembly.