As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EN ROUTE, THE CREW RECEIVED A LEFT HAND PROP LOW OIL PRESSURE INDICATION AND RETURNED TO TYS. MAINTENANCE INSPECTED AND SERVICED THE LEFT HAND OIL AND CLEANED THE CANNON PLUG ON THE LOW PRESSURE SWITCH THEN PERFORMED GROUND RUNS WITH THE CREW IN ACCORDANCE WITH DORNIER MAINTENANCE MANUAL 79-00-00. ALL CHECKS WERE GOOD AND THE AIRCRAFT WAS THEN RELEASED FOR SERVICE.