As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, THE CREW RECEIVED A 9A EMERGENCY DOOR LIGHT INDICATION ON THE RED WARNING PANEL. FLIGHT DESCENDED TO 9000 FEET AND THE LIGHT WENT OUT. MAINTENANCE INSPECTED, CLEANED, AND RESEATED THE DOOR AND PROXY SENSOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.