As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING EMERGENCY LIGHT TEST, FAULT INDICATION OF LEFT EPSU UNIT. FOUND WIRE HARNESS D9299200900200 AT SEAT 3C CHAFED CAUSING FAULT DURING TEST OF THE EMERGENCY LIGHTING SYSTEM IAW 33-51-00-710-001. ITEM PLACED ON MEL UNTIL PART CAN BE REPLACED. REMOVED AND REPLACED HARNESS & LT EPSU OVERWING EXIT.