Gallien Krueger 700RB II - Bad Ground

[rf7]

Hi,

I can't find where the audio ground connects to the chassis on this amp. This thing hums pretty loudly, until I jump the audio ground to the chassis. Anyone know how audio ground is supposed to connect to the chassis on this unit?

[rf7]

I figured it out. It grounds through the case of pot R26 on the front panel. The trace wasn't making it there, had to jumper it.