As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: CREW REPORTED WITH POWER OFF AND EMERGENCY LIGHTS ON, ONLY THE AFT GALLEY EXIT LIGHTS WORK, ALL OTHERS ARE INOPERATIVE BUT WITH POWER ON THE EMERGENCY LIGHTING SYSTEM WORKS FINE. MAINTENANCE REPLACED THE BATTERIES IN EMERGENCY POWER SUPPLY UNITS 10WL (AALA202302154406), 11WL (AALA202302152431) AND 12WL(AALA202302155604) PER AMM 33-51-38. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED PER AMM 33-51-00.