As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING PREFLIGHT INSPECTION, THE CREW REPORTED THAT THE EMERGENCY LIGHT BATTERY PACK AT 15 WL WAS INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE AFFECTED POWER SUPPLY AIW ATR 42-320 JIC 33-51-21, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE. (M)