What was found
VERY STRONG ODOR OF BURNING ELECTRICAL ODOR IN CABIN OF ACFT. BOX ASSY FOUND DAMAGED DUE TO HEAT FROM ARCING FIRE OF EXTERNAL PWR PLUG. FIRE ODOR DIMINISHED SOURCE WAS GROUND PWR RECEPTICLE. BOX ASSY REQUIRES REPLACEMENT. STARTED TO REMOVE BOX ASSY. ALL ELECTRICAL CONNECTIONS DISCONNECTED (PARTS IN AREA) AND SOLID RIVETS REMOVED FROM ATTACHING FLANGE. REMOVED BOX ASSY. STARTED TO TRANSFER LATCH, STOPS & PICKED UP HOLES FOR HINGE. COMPLETED INSTALLATION OF RECEPTICLE BOX. ACCOMPLISHED ZONAL INSP OF FWD AVIONICS COMPARTMENT AFTER COMPLETION OF REPAIR TO EXTERNAL POWER RECEPTICAL. NO SIGNS OF DAMAGE OR BURNING IN AREAS.