As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - DURING MAINTENANCE, THE EMERGENCY LIGHTS FAILED AN OPERATIONAL TEST. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY LIGHT BATTERY AT THE 18WL POWER SUPPLY OCATION. THE LIGHTS OPERATIONALLY CHECKED GOOD AND THE AIRCRAFT WAS AIRCRAFT WAS RETURNED TO SERVICE. (M)