Fender Switching Problem

[RAJPE]

I have a Hot Rod De Ville 212 which switches on its own for a few seconds from the clean channel to the dirty channel.  I checked the 16 V power supply and was +/- 16.8 volts.  The 330 ohm resistors get hot but not extremely so.  Any suggestions on what else to check?

[sluckey]

Does the LED color change also?

The problem could be almost anything between the foot switch and the relays. Lot of circuitry for a poor solder connection to hide. Maybe even a bad IC, transistor, diode, cap, etc.