As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: FLIGHT ATTENDANT REPORTS EMERGENCY EXIT LIGHTS FLASHED ON/OFF MULTIPLE TIMES IN FLIGHT. MAINTENANCE FOUND FORWARD LEFT EMERGENCY POWER SUPPLY UNIT 10WL FAULTING AND LOW VOLTAGE ON THE RIGHT EMERGENCY POWER SUPPLY UNIT. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 10WL (AALA202303289286) AND BATTERY PER AMM 33-51-38 (AALA202303283376). ALSO REPLACED THE BATTERY FOR THE RIGHT EMERGENCY POWER SUPPLY UNIT PER AMM 33-51-38 (AALA202303282519). A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED.