Leave it on!
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Sorry for the jest, but I imagine there are many things that could do it. Without a schematic it is hard to tell. I tend to leave SS gear on regardless. Leave it on or get it fixed, lest you take out a driver passing DC. I'd have it looked at straight away myself, in case there is some sort of bias mismatch or a part nearing failure -even if it sounds "right".
I did check the bias and it measures OK as specified in the service manual. Also the left speaker terminal measures 0 volts DC ~2 seconds after exiting protection mode - the right one always measures 0.
It was checked out by Desco Service Company of Olympia, Washington and they said it was OK other than the popping.
How much DC does it take to damage a driver? Won't a high pass filter block DC?
I may take it in to United Radio in Syracuse NY and have them look at it. In the meantime I my friend at work is going to look at the schematic and see if he can identify any likely culprits.