How'd you make out with your amp, BGD?
I'm going through a similar exercise right now with my amp, and have a few more things to try before going to a tech. I'll try the simple steps myself, but will call it quits if I can't solve the problem. I think we've all found out (from experience) that there are two questions we should resist asking:
"I wonder what will happen if I do this? What could possibly go wrong?"
ACOUSTICS: Cordoba D10-CE / LaPatrie "Concert" / Takamine GD30CE-12 / Norman ST30
ELECTRICS: EP Les Paul Custom Pro / Gretsch Streamliner G2420T / Cort GB34 Bass
AMPS: Traynor YCS50 / Tenement Funster VK212 / Traynor AM150T / Fender Rumble 150
EFFECTS: Boss ME-80 Multi-effects / Ibanez WD7 wah