Schneider TA 4000 sound issue.

Hi,


I have a problem with my Schneider TA 4000, sound still coming out of the right channel when volume is at zero. The issue is not in the balance or volmue potentiometers and I have not been able to track down the service manual. Any ideas on what is happening, is there a simple pot to tweek, thanks?


PS How do folks get the boards so clean, is there a special super small cotton bud that does fall apart?