As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE EN ROUTE FROM TYS TO PHL, THE CREW RECEIVED A MAIN CABIN DOOR LIGHT ON THE RED WARNING PANEL. THE CREW DECLARED AN EMERGENCY AND DIVERTED TO TRI. OUTSTATION DETERMINED THE PROBLEM WAS DUE TO THE MAIN CABIN DOOR OVER CENTER PROXI SENSOR. THE AIRCRAFT WAS FERRIED TO PIT WHERE MAINTENANCE INSPECTED AND ADJUSTED THE MAIN CABIN DOOR OVER C ENTER PROXI SENSOR IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 52-00-00. OPERATIONAL CHECKS WERE PERFORMED AND THE AIRCRAFT WAS RELEASED FOR SERVICE.