I would only add : reverse the interconnects,could have ic problems or pre problems. Might as well rule that out.
amp is hot on one side cold on the other
I have a forte 1a amp, the last time I plugged it in I noticed that the left side of it was running hot after about twenty minutes or so yet the right side was cool, also when I shut the amp off while still playing the left side stops immediately while the right continues to play for a while, thanks for any help, mike