The main volume control works manually, it just doesnt work from the remote control.
The other non-motorized volume controls (center & surround) work fine from the remote as well as the other remote functions.
I am fortunate to have another working unit to swap parts with.
This is what I have done so far:
I swapped the motor control modules (RVR) between both units. Both work fine in the working receiver.
I swapped the (RSC) modules/boards between both units. Both work fine in the working receiver.
The motor control module (RVR) has a 7 conductor flat cable that goes to the main receiver board.
Any help anyone can give as to were to check next would be greatly appreciated...