As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER DEPARTING PIT, THE CREW RECEIVED A GROUND/AIR DOOR OPEN INDICATION ON THE RED WARNING PANEL. FLIGHT 4141 RETURNED TO PIT WHERE MAINTENANCE INSPECTED AND ADJUSTED THE MICROSWITCH IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.