As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- WHILE PERFORMING A SERVICE CHECK MAINTENANCE NOTED THAT THE MIDDLE SECTION OF EMERGENCY LIGHTING FAILED TO ILLUMINATE. MAINTENANCE REMOVED AND REPLACED THE NR 2 (TWO) EMERGENCY BATTERY POWER SUPPLY, PERFORMED A OPERATIONAL CHECK OF THE EMERGENCY LIGHTING SYSTEM. NO DEFECTS NOTED AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.