What was found
UPPER DECK WINDOW LIGHTS AT SEATS 12AB AND 14GH PREVIOUSLY DEFERRED INOP. ON TAXI TO INBOUND GATE CIRCUIT BREAKERS TRIPPED ON P180 AND P414 PANELS. FOUND SEVERAL BURNT AND OVERHEATED WIRES COMMON TO WIRE BUNDLE W7510. *S/D* FOUND EVIDENCE OF ARCING ON AIR DISTRIBUTION DUCT AND SIDE WALL PANEL END CAP LIGHT ASSY UPPER EDGE (P/N 417U7572-1 ASSY 417U7514-1 DETAIL). REPAIRED FIBERGLASS WIRE/WOUND AIR DISTRIBUTION DUCT AND INSULATION. REMOVED DAMAGED WIRE SECTIONS AND SPLICED IN NEW WIRE SECTIONS AND SECURED CLEARANCE BETWEEN SIDE WALL PANEL END CAP UPPER EDGE. TESTED ALL EFFECTED SYSTEMS.