As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAH - FLIGHT 2556 THE CREW REPORTED THAT THE OVERWING EMERGENCY EXIT LIGHTS ILLUMINATED IN FLIGHT WITH ALL OTHERS OFF, AND FINALLY EXTINGUISHED AFTER APPROXIMATELKY 20 MINUTES. THE AIRCRAFT LANDED AT IAH WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE AFFECTED EMERGENCY LIGHT BATTERY PACK, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.