As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A POST-FLIGHT INSPECTION, THE PILOT NOTED EXCESSIVE OIL ON THE LOWER COWL AND DOWN THE LEFT SIDE OF THE AIRCRAFT. UPON FURTHER INSPECTION, DETERMINED A NR 2 BEARING OIL SCAVENGETUBE COUPLING O-RING LOCATED AT C-FLANGE WAS LEAKING. UPON REMOVAL OF THE O-RING, IT WAS FOUND TO BE 75 PERCENT CUT IN HALF. THE O-RING WAS REPLACED. (X)