Hi guys, I'm getting a loud popping through both speakers with this receiver. Some background info and what I have observed so far: - Bought off craigslist in the Northern Virginia area last year. Original owner said service bulletins had been performed at some point by an AKer in Maryland (merrylander?). - Worked fine for around two months, and then a loud popping started intermittently. Sometimes shortly after start up, sometimes after an hour of clean listening. Sound never cuts out or the receiver never turns off, just a loud "pop" or "pop-pop," sometimes every 30 minutes, sometimes a couple times in a 5-minute period. Popping volume seems volume dependent, as in how loud the pop is corresponds to how loud the music is. Doesn't matter what input source or speakers. Do sometimes hear the pops when no input is playing, but more often when there is one playing. - Took in to local hi-fi repair in Virginia and they could not replicate the problem. Took home and problem immediately presents itself. Put aside for 4 months. Do my first attempt at de-oxit (not super thorough, admittedly) recently when I got a turntable. Popping seemed to be gone after de-oxit and having sat for 4 months and then after 15-20 hours of combined listening, now it's back. - I was sitting next to it waiting to see if the meters jumped when it popped today and for the first time I actually saw a decent sized static/electric arc inside through the metal grill on top when it popped. Any ideas? Ideally I would have someone work on it but I was a little disheartened paying $50 to have it sit in a shop and not have the problem replicate and I don't know where else in the DC Metro area to try. I also had the thought that maybe it was the electricity in my home if the problem didn't replicate somewhere else, but I've never had an issue with any modern equipment. Now seeing the spark / arc I hope that's enough info to hopefully point me in a direction. I've said before that I hate to part with it because I do love the way it looks and sounds with a "new" set of Polk SDA-1C's I just got, but I'm almost ready to give it up in favor of reliability of something else.