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 EMERGENCY LIGHTS AFT OF THE EMERGENCY ROW WERE FOUND TO BE INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY LIGHT POWER SUPPLIES AND BATTERY PACKS #3 AND #4. EMERGENCY LIGHTS WERE OPERATIONALLY TESTED WITH NO DEFECTS AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.