As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EFD - DURING MAINTENANCE INSPECTION, THE AISLE PATH EMERGENCY LIGHTING WAS FOUND TO BE INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE NR 1 AND NR 3 EMERGENCY LIGHT BATTERY PACKS IAW ATR42-320 MM 33-51-21, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)