lmcclaf wrote:
I've got the same system and have had the same problem numerous times.
The slider volume control has been the culprit on mine. Once I gave it
a very vigorous cleaning it worked great for a while. Every once in a
while I've got to do it again. In fact it is starting to act up again
now so I guess I should dig into it. I ordered the service manual way
back when I first bought the system so if you have any questions about
any specific part I can give you the reference from the manual.

Cheers,
Lawrence

I was going to say... how about just cleaning the controls?

Mark Z.