As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POST FLIGHT INSPECTION THE CREW REPORTED THAT WHEN TURNING OFF THE EMERGENCY LIGHTS WITH EITHER THE APU ON OR GCU SELECTED, CAUSES THE EMERGENCY LIGHTS TO COME ON. MX INSPECTED THE ACFT AND R & R THE NR ONE EMERGENCY LIGHT BATTERY PACK POWER SUPPLY, OPS TESTED WITH NO DEFECTS, AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.