As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MCI - DURING MAINTENANCE INSPECTION, THE EMERGENCY EXIT MARKER AT ROW 12BC WAS FOUND TO BE INOPERATIVE. MAINTENANCE REMOVED AND REPLACED THE EMERGENCY LIGHT INVERTER FOR THE AFFECTED LIGHT, OPERATIONALLY CHECKED WITH NO DEFECTS, AND THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.