As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- DURING MAINTENANCE INSPECTION THE EMERGENCY LIGHT BATTERY PACKS AT LOCATIONS 3 & 4 WERE FOUND TO BE NOT HOLDING A CHANRGE. MAINTENANCE REMOVED AND REPLACED THE AFFECTED BATTERY PACKS, OPERATIONALLY TESTED WITH NO DEFECTS AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.