not a mesa dealer no schematic.they have made changes in the circuit in question. he told me of a couple of parts they changed but wouldn't give any other information except sorry we can't let you change the parts. send it back to the factory....now a 15 minute job for me is going to turn into a 30 day wait for the amp!don't forget it's on the opposite coast. wish i could of helped with a schematic or service manual. i would of been helpful instead of a pita...thanks for everyones help!my good friend and tv repairman of 40 years big jim gave me the sugestion to raised the resistor off the board to cut down on heat radiating to the circuit board and the ceramic cap and resistor in front and back of the 10k wirewound.guess they must of herd you jim!!!...later....ed