As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED A PAX DOOR/SERVICE DOOR CAUTION MESSAGE IN FLIGHT. CREW DIVERTED TO TYS AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE PROX SENSOR ELECTRONIC UNIT IN ACCORDANCE WITH THE AIRCRAFT MAINTENANCE MANUAL. AIRCRAFT WAS RELEASED FOR SERVICE.