I have an annoying problem with my MXR-130 Receiver. Occasionally, one of the audio channels will fade to a low volume or just to nothing. Both channels do it randomly. On occasion, both channels will do it at the same time. When it first happened, turning the volume and or balance knob seemed to bring them back. Sometimes you would have to be aggressive in operating the knobs. I took the cover off to access these pots. I sprayed a lot of contact cleaner in the little holes on the pots and operated them while spraying. This seemed to work for a while. But it still does it. Now operating the knobs sometimes works and sometimes not. Turning the unit off and back on does seems to work. I cannot pin point a solution that works consistently. Kind of hit or miss.
So this is what I am thinking now. Could it be the output relays? Or do I have dead spots on the balance or volume knob which would require replacements?
Any help or advice is appreciated and welcome.