As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SEVICE CHECK OF EMERGENCY LIGHTS, RECEIVED MESSAGES AFT LT EPSU INTERNAL LOAD AND AFT LT EPSU EXTERNAL LOAD. PERFORMED BITE OF AFT LT EPSU GOT INTERIOR LIGHTS FAULT AND EXTERIOR LIGHTS FAULT FLASHING. FOUND OPEN LINE BETWEEN EPSU AND AFT R DOOR PROXIMITY SWITCH 17WV2. RESET CIRCUIT BREAKERS AND ADJUSTED THE PROXIMITY SWITCH. EPSU BITE TEST OK AND EMERGENCY LIGHT TESTED NORMAL.