These are the best OEM schematics that I have been able to round up so far.
Power Schematic
These are the same schematics as the factory ones, only these are drawings I generated with AutoCad and converted to PDF files. These are a lot more legible. I also created a chassis layout from some documentation originally created by Seymour Duncan which sent to me by an amp tech that used to work on these amps a lot.
For Preamp Module Schematics:
Preamp Module Schematics