Does anyone have the Mode Four Preamp Schematics?

[nuno]

I need the Mode Four Preamp schematics because my mode four started to make some strange noises on OD 2 and them one day OD2 just stopped making any kind of sound and the crunch/clean channel now a lot less gain, and that could be a preamp problem and if someone had the preamp schematic i could fix it a lot more faster.
Thak you all.