As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: EMERGENCY LIGHTING SYSTEM OPERATIONAL CHECK WAS BEEN ACCOMPLISH AND FAULT 33-11409 WAS FOUND ON EXISTING FAULTS STEP B 2 OF CARD # 78T21033001. WELS CONTROL UNIT (AALA202106219021) AND BATTERY REPLACED AT M3351041 (AALA202106219031), CONNECTOR, RESEATED AND SOFTWARE LOADED. NO FAULTS NOTED. ACCOMPLISHED WORK CARD 78T21033001 IAW AMM 33-31-07 & SSM 33-51-10