Picked up a SX-780 about 6 months ago. Since then I discovered it has a couple of issues. Issue 1: left channel louder than right channel. If I flip down the Mono switch, the left channel meter deflects more than the right channel. Issue 2: left channel has no sound at low volume. This is a strange one to me. After I turn on the receiver, and turn the volume up a bit, there is sound on the right channel, but not on the left. When I get the volume to about 10 o'clock the left channel has some static and then comes in fine. I can then turn the volume back down and both channels have sound. After about 1 - 2 minutes, the left channel fades out. If I turn the volume up again, the process repeats. This happens for about the first 15 minutes of operation. After that the left channel volume is fine at all volume levels. What I have done so far: Use Deoxit D5 on all pots and switches from inside (volume, balance, etc.), working each pot/switch multiple times. Followed this with tuner cleaner to remove the Deoxit residue. Checked that the "loudness" switch was not the fault, but channel imbalance did not change with switching this on or off. The balance issue is better after doing the cleaning. I now notice only a slight imbalance if any. However, the left channel volume issue remains. I'm guessing this is a dirty volume pot on the left channel? How easy is it to take this apart for cleaning, or should I be taking this to a tech? Thanks!