Thought I'd post this in case anyone else runs into this. I picked up a 1997 Crate GX140C Stereo Chorus Combo off C:L for $50. Guy said it wouldn't switch channels. Otherwise is was working. I got it home and found that it wouldn't switch between Gain 1 and Gain 2 on the distortion channel and wouldn't switch channels. Pulled the chassis and hooked it up. While messing with the channel select button I wiggled the multi-wire board connector and it switched channels. Pulled that connector, (and it's an el-cheapo). Wires are crimped into the connector ends like a scotch-lock. I reseated the wires and presto, the amp works perfect! It has Eminence speakers, and it actually sounds pretty good!
Also found that one of the TRS cables for the footswitch is bad. Easy fix on that one.
Also found that one of the TRS cables for the footswitch is bad. Easy fix on that one.