As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR2 ENGINE BEGAN TO RUN ROUGH IN CRUISE. ENGINE POWER REDUCED FOR DESCENT - ENGINE SHUTDOWN FOR LANDING. POST FLIGHT INSPECTION FOUND THE NR8 CYLINDER HEAD HAD SEPARATED FROM THE BARREL. CYLINDER REPLACED AND THE ENGINE WAS GROUND RUN SERVICEABLE.