As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING THE OPERATIONAL TEST OF THE EMERGENCY LIGHTING SYSTEM, FAULT MESSAGES FOR THE FORWARD LEFT AND AFT LEFT EMERGENCY POWER SUPPLY UNITS DISPLAYED. MAINTENANCE REPLACED EMERGENCY POWER SUPPLY UNIT 10WL (AALA202307259969) AND EMERGENCY POWER SUPPLY UNIT 13WL (AALA202307250677) PER AMM 33-51-38. MAINTENANCE ALSO FOUND A SHORTED WIRE AT CONNECTION FOR CEILING LIGHT 205WL AND REPAIRED IT PER ESPM 20-44-11. (AALA202307251335)