As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED THE LEFT ENGINE RUNNING ROUGH IN FLIGHT AND OIL PRESSURE WENT TO ZERO PSI. PRELIMINARY INSPECTION FOUND METAL CONTAMINATION IN OIL FILTER, #4 CYLINDER INTAKE PUSH ROD BROKEN AND A LARGE GAP AT THE EXHAUST ROCKER ARM. THE ENGINE IS BEING REPLACED AND SENT TO CMI FOR FURTHER ANALYSIS. FURTHER INFORMATION ON THIS EVENT CAN BE PROVIDED BY THE OEM.