As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING B INSPECTION FOUND SEVERAL EMERGENCY LIGHTS INOPERABLE. SUSPECT NR 2 POWER SUPPLY FAULT. THE AIRCRAFT WAS REMOVED FROM SERVICE. TROUBLESHOT EMERGENCY LIGHTING SYSTEM IN REFERENCE WITH W/M 33-50-50 ALL INOPERATIVE LAMPS POWERED BY NR 2 EPSU. REMOVED AND REPLACED THE NR 2 EMERGENCY BATTERY AND POWER SUPPLY UNIT IAW W/C 33-700-19 EMERGENCY LIGHTING SYSTEM OPC W/C 33-700-17 WAS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE.