It's not too hard to check the switch and servo, GDL's oft posted site has the info. Don't be shocked if everything comes out ok and the amp is bad. I'm not convinced checking the joints with a meter would always show a bad one. Maybe, but it depends on how a circuit is layed out.
Checking the IC's, I'd just replace them there so cheap. Search Google for the part number, I found them all eventually.
Are you planning to try and diag and replace parts on your amp if need be? I'm curious how that would work out as I'm under the assumption that there indevidualy calibrated on the bench acording to what the specs of the specific parts in them happen to be. See the resistore on the little metal stakes? I think those are for calibration. Friend of mine came up with that threory, but I buy it completly.
