What was found
DURING TROUBLESHOOTING OF A PILOT DISCREPANCY FOR THE LAV VANITY LIGHTS INOPERATIVE, MAINTENANCE TECHNICIANS FOUND WIRING THAT APPEARS TO HAVE BURNED THROUGH NEAR AN OXYGEN LINE IN THE PSU. ADDITIONALLY, 2 LIGHTING INVERTERS WERE FOUND FAILED. THE BURNED WIRING WAS LOCATED NEAR THE LIGHTING POWER SUPPLIES WHICH HAVE A HISTORY OF RUNNING HOT AND BURNING WIRES IN THE OVERHEAD PSU. THE WIRING WAS REPLACED AND ROUTED FURTHER FROM THE POWER SUPPLIES.