tapetech
Repair Professional
Problem can't be SW1 or SW7 because you just said that both VU meters indicate music in play mode. So the "one play channel out" defect is after the point where VU meters read audio level.
I asked you if a channel is out when you are in record source mode and you did not answer. I can't help without getting answers.
I asked you if a channel is out when you are in record source mode and you did not answer. I can't help without getting answers.