As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI - DURING ROUTINE INSPECTION THE REAR CEILING EMERGENCY LIGHT WAS FOUND TO BE INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE NUMBER 4 EMERGENCY LIGHT BATTERY POWER SUPPLY IN ACCORDANCE WITH EMB-145 AMM 33-50-04 AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.