As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH- DURING PREFLIGHT THE CREW NOTED THAT THE EMERGENCY LIGHTS WERE NOT ILLUMINATED IN THE FRONT PART OF THE CABIN. MAINTENANCE REMOVED AND REPLACED THE NR 1 EMERGENCY BATTERY, PERFORMED AN OPERATIONAL TEST OF THE EMERGENCY LIGHTING. CHECKED GOOD AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.