Results on the output stage MOSFETs:

According to Ross's trouble shooting info, I should have seen something other than 0v on the pin 2 of all of the MOSFETs. From my testing it looks like set Q2xx is the only one getting voltage, while sets Q1xx, Q3xx, and Q4xx are not. Hmm. I think that will end my poking around in the amp for tonight. Guess I'll wait and see what the knowledgeable folks here have to say.

Cheers,
-Randy