As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING OPERATIONAL TEST OF THE EMERGENCY LIGHTS, SEVERAL LIGHTS DO NOT TURN ON AT L3 DOOR AND CEILING NEAR TO L3 DOOR. FAULT ISOLATION PERFORMED IAW FIM 33-51 TASK 806. FOUND M33405 EMERGENCY POWER SUPPLY INOPERATIVE. M33405. BATTERY PACK REPLACED IAW AMM 33-51-06-960-802. TEST OK.