Not a problem. Any pool of knowledge is better than seemingly yelling into the void.
The diagram is near the back of the service manual mixed in with the PCB layouts.
The jumper bypasses the need for the CO-V300 or similar to be attached. It delivers the voltage which closes the relay and allows the autochanger to power on. Without the controller attached or powered on the relay can't close so the jumper just bypasses the relay entirely.