Schematic for the B500B Needed, issues with both channels...

[BoWeevil]

Hey all,
I think I may have some issues with this B500B I just picked up.
The Low "A" Channel seems to have some weird noises as you turn the potentiometer, almost like there is an issue with load applied that finally dissipates when the pot is wide open.
The High "B" Channel is now distorting, even at very low input and output levels.
Is there a schematic for this baby out there somewhere?
Thanks in advance,

[MarshallJMP]

Send me an email and i'll mail you the schematics.