What was found
WHILE EN ROUTE, THE FLIGHT CREW RECEIVED A RED WARNING PANEL DOORS ALERT AND A MAIN CABIN DOOR CAS MESSAGE. MAINTENANCE CONTROL INSTRUCTED THE CREW TO RETURN TO THE FIELD WHERE THE AIRCRAFT LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED AND CLEANED THE SHOOT BOLT IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-0O THERE WERE NO FURTHER DEFECTS NOTED AND THE AIRCRAFT WAS RETURNED TO SERVICE.