That amp is hilarious. Bought it not working for cheap, easy fix to get working. Someone also tried to mod it, I put it back to stock and did a bunch of maintenance on it. Looking at the schematic, they basically borrowed heavily from a Mark II.
A bunch of various videos of this model but only the clean channel. Figured I would do one of the Lead channel. It’s not as bad as people make them out to be. Seems many just gut these and start over.