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has anyone tried to take a receiver apart?

In the past, I've completely dismantled a Sony receiver and replaced its servo-controlled volume knob.

You could be looking at something as simple as a loose solder joint, or something as complex as a faulty component. But since you haven't tried to open it and actually look for the loose solder joint, I'm guessing that's not the sort of thing that you'd likely be prepared to repair yourself. If you were, you would have done that already.

The era of the local corner stereo/TV repair shop is waning, but a riffle through the phone book might prove fruitful. You might find someone to help you out.
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Tony Fabris