As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW RECEIVED A MAIN CABIN DOOR LIGHT AND A SQUEAL COMING FROM THE DOOR. THE CREW FOLLOWED THE QUICK REFERENCE HANDBOOK AND RETURNED TO PIT. MAINTENANCE INSPECTED AND REPLACED THE OVER CENTER SWITCH ON THE MAIN CABIN DOOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.