Sweetbeats,
I think I've got it...using my meter, and sending tone through the buss ins, I compared a good channel with the bad channel. The signal output stopped at pin 1 of IC 101 on the monitor A board, which affects everything downstream of it. I have a new 101 on order.
Thank you for taking the time to help me. Greatly appreciated. Good luck getting your bike up and running. Looks very cool!
Best regards,
Don