As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOSS OF OIL PRESSURE IN-FLIGHT. THE FLIGHT WAS TERMINATED IMMEDIATELY AND THE ENGINE WAS SHUT DOWN. UPON INVESTIGATION, THE ENGINE OIL PUMP DRIVESHAFT WAS FOUND BROKEN. WHEN PUMP WAS REMOVED, A PIECE OF GEAR TOOTH FELL FROM PUMP OIL PASSAGE. GEAR PIECE IS FOREIGN TO THE OIL PUMP. AT THIS TIME, IT IS NOT KNOWN WHERE THE GEAR TOOTH CAME FROM.