What was found
(CAN) ARCING OF CHAFED WIRES WAS DISCOVERED BEHIND THE LT PANEL FORWARD OF THE MAIN CCT BREAKER PANEL (P/N 2613181-18). THE WIRE BUNDLE WAS RUBBING AGAINST THE PRIMARY STRUCTURE BEAM WHICH RUNS BETWEEN THE FIREWALL AND THE DOOR SILL ON A 45 DEGREE ANGLE. THE WIRES THAT WERE FOUND TO BE ARCING WERE: AA-LB15, AA-LB43 & AA-LB48. THESE WIRES ARE LIGHTING CIRCUIT RELATED, BUT THE WIRE BUNDLE THEY ARE IN IS OVER 1 INCH IN DIAMETER AND CONTAINS POWER WIRES FOR MOST OF THE SYSTEMS IN THE AIRCRAFT. THE WIRES WERE REPAIRED AND A PROTECTIVE COVER WAS INSTALLED OVER THE WIRE BUNDLE.