What was found
(CAN) ELECTRICAL SHORT, ARCING, HAPPENED WHEN CLOSING THE 20000VU PANEL, LOCATED IN THE CABIN CEILING AFT OF THE FWD GALLEY. SUSPECT WIRE CHAFING ON THE 20000VU PANEL , WIRE BUNDLE SEEMS TO BE TO LOW AND SEAT ON THE PANEL WHEN THE PANEL IS CLOSED, CAUSING WIRE CHAFING WITH THE ACFT VIBRATION. WIRES REPLACED, REPOSITIONNED WIRE BUNDLE TO ELIMINATE FUTURE CHAFING.