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 OPEN LIGHT ON THE RED WARNING PANEL AND RETURNED TO PIT. MAINTENANCE INSPECTED AND ADJUSTED THE OTHER THE CENTER PROXY SENSOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.