First timer here. I have a 6100LM and the 3rd channel (high gain) is starting to go out. It sounds as if you are using a distortion pedal with a dead battery in it. Does anyone have any insight as to what the issue may be? The clean and crunch channels both work fine. I’ve never serviced an amp before but I’m sure I can fix it if it’s only a parts swap issue. Thanks in advance for any insight anyone may have.