As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LOW OIL PRESSURE DURING FLIGHT. DECLARED EMERGENCY LANDING. UPON INSPECTION EXCESSIVE COKING WAS FOUND AT TURBOCHARGER DRAIN CAN. THIS PREVENTED SCAVENGE PUMP FROM RETURNING OIL TO ENGINE RESULTING IN EXCESSIVE OIL LOASS PART THE TURBO SEALS.