What was found
EMERGENCY LIGHT TEST FAILED SHOWING UNIT AFT L FAULT. FOUND UNIT FAULT ON EPSU. WHEN NEW EPSU WAS INSTALLED THE INTERNAL EXTERNAL LIGHT WAS FLASHING SAYING SHORT TO GND. EXAMINED ELE PLUG 13WLA FOUND BROKEN BACK SHELL AND NUMEROUS EXPOSED BARE WIRES. SUSPECT SHORT DAMAGING EPSU. REPLACED PWR SUPPLY AND REPAIRED BACKSHELL. WIRES ARE NOT DAMAGED, WHITE PAINT IS SCRAPED OFF, EXPOSING GOLD TINTED INSULATION. DAMAGED CABLE CAUSING PROBLEM. FOUND AFT SEAT PWR CABLE SHORTED OUT. REPLACED 350WL10 HARNESS AT SEAT 23-24, OPS CHECK OKAY.