What was found
ON GROUND ROLL ONTO RAMP, CREW REPORTED DETECTING AN ELECTRICAL SMOKE AND SAW SMOKE EMITTING FROM BEHIND LT SIDE OF INSTRUMENT PANEL. CREW TURNED OFF BATTERY POWER AND PARKED ON RAMP. NO FURTHER ACTIONS REQUIRED. MX FOUND OVERHEAT EVIDENCE ON THE ANNUNCIATOR DIMMER SWITCH/POTENTIOMETER DIMMER WIRES (TOP OF SWITCH HAD EVIDENCE OF BUILD UP OF DUST AND FUZZ THAT HAD SMOLDERED) AND THE POTENTIOMETER FROZEN. SWITCH ASSY WAS REPLACED AND SYS DEFERRED PENDING ADDITIONAL TROUBLE SHOOTING AND SYS INSP.