As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ROUTINE GROUND MAINTENCE OIL WAS DISCOVERED EMINATING FROM THE ENGINE COWLING. INVESTIGATION WHICH INCLUDED WASHING DOWN THE AREA AND A RUN UP REVEALED OIL LEAKING FROM THE RELIEF VALVE ADJUSTMENT NUT. REPLACED PROPELLOR GOVERNOR, RAN ENGINE NO LEAKS FOUND.NO PART NUMBER AVAILABLE FOR THE ADJUSTMENT NUT/RELIEF VALVE