As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, THE CREW RECEIVED A GROUND AIR DOOR WARNING DURING CLIMBOUT AND RETURNED TO PIT. MAINTENANCE INSPECTED, CLEANED AND ACTUATED THE DOOR SWITCH IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.