What was found
AFTER DEPLANING FLIGHT 3180 GROUND OPS HOOKED UP EXTERNAL POWER. SHORTLY AFTER, VISIBLE SMOKE WAS SMELLED IN CABIN. MAINTENANCE VISUALLY INSPECTED CABIN AREA, FOUND SIDEWALL LIGHTS AT ROW 1-5 AND OVERHEAD LIGHTS AT ROWS 9A AND 10, SUSPECT BAD LIGHT SOCKET AND/OR BALLAST. DEFERRED ALL SIDEWALL LIGHTS AS A PRECAUTIONARY MEASURE DUE TO SMOKE IN CABIN SMELL. MAINTENANCE RESET BREAKERS, RELAMPED LIGHTS. MAINTENANCE PERFORMED FURTHER INVESTIGATION AND TROUBLESHOOTING FOUND SUPPLEMENTAL A/C MOTOR BURNED AND MELTED. MAINTENANCE REPLACED MOTOR.