As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: FLIGHT CREW REPORTED THAT THE SMALL SQUARE EXIT LIGHTS ADJACENT TO THE TWO AFT DOORS ARE RANDOMLY FLASHING - MAINTENANCE FOUND A FAULT MESSAGE FOR EMERGENCY POWER SUPPLY UNIT 13WL - REPLACED EMERGENCY POWER SUPPLY UNIT 13WL *AALA202608201673* AND BATTERY *AALA202608207891* PER AMM 33-51-38