What was found
DURING PAX LOADING SMOKE AND ELECTRICAL FUMES NOTED BY CREW, BY L-4 DOOR PA PNL. DE-PLANED ACFT, FIRE DEPT NOTIFIED. INSPECTED L-4 DOOR FLIGHT ATTENDANT PA PANEL WIRING IAW MM 20-30. FOUND WITH FIRE DEPARTMENT THAT THE L-4 DOOR RESISTOR R4-139 HAD OVERHEATED AND POPPED THE L-4 DOOR CONTROL CIRCUIT BREAKER. FOUND THAT NO WIRES WERE DAMAGED. WITH L-4 DOOR CONTROL C/B PULLED THERE IS NO POWER TO RESISTOR R4-139. DEFERRED L-4 DOOR ELECTRICAL OPERATION IAW MEL 52-1 CAT-C. L-4 DOOR ELECTRICALLY INOP DUE TO OVERHEATED RESISTOR R4-139 ON FLIGHT ATTENDANT PANEL (L-4 DOOR)