As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED ENG OIL DOWN BELLY OF ACFT. FIRST TROUBLESHOOTING WAS TIGHTENING AN OIL FLEX HOSE THAT WAS SLIGHTLY LOOSE, NO CHANGE. FURTHER INSPECTION REVEALED OIL LEAKING AT BASE OF PROPELLER GOVERNOR. GOVERNOR WAS REMOVED & GOVERNOR BASE GASKET CHANGED, STILL LEAKING OIL. FINALLY A THOROUGH CLEANING & INSPECTION WITH A BLACK LIGHT REVEALED THAT THE GOVERNOR ITSELF WAS LEAKING. THE GOVERNOR WAS REPLACED WITH AN OVERHAULED UNIT WITH NO FURTHER LEAKAGE NOTED.