As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN FLIGHT FAILURE OF ENGINE DURING CRUISE. ENGINE DISASSEMBLY AND ASSESSMENT FOUND INCORRECT PROPELLER GOVERNOR GEAR SHAFT SET SCREW P AND INCORRECT SAFTEING PROCEDURE USED FOR PEENING OF THE SET SCREW. SET SCREW CAME LOOSE INSIDE OF ENGINE CAUSING THE JAMMING AND FAILURE OF THE ENGINE NR 1/NR 2 INTAKE VALVE HYDRAULIC TAPPET BODY. DEBRIS IN THE ENGINE WHILE RUNNING CAUSED MULTIPLE FAILURES OF THE ENGINE COMPONENTS.