As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ENGINE SHUTDOWN IN CRUISE AND THE AIRCRAFT MADE AN UNSCHEDULED LANDING, AFTER THE ENGINE EXPERIENCED ROUGH RUNNING. POST-FLIGHT INSPECTION FOUND AN EXHAUST VALVE WITH THE HEAD DETACHED/FRACTURED. THE PISTON AND CYLINDER WERE DESTROYED AND THE OIL PAN WAS DAMAGED. THE ENGINE WAS REPLACED FORWARD OF THE FIREWALL.