Hello, new to the group , Jan here, i work on Guitars and am trying to learn how to fix Amps and need help , i cannot find a schematic for this cabinet, it keeps cutting out and when it does the two led on circut board go out but the main power to cabinet stays on, how would i check with a multimeter, anyone who can help, it would be greatly appreiated, and if anyone needs help with Guitars, just give me a holler, Jan