As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED PARTIAL LOSS OF POWER AND VIBRATION FROM RIGHT ENGINE ON CLIMB-OUT. UPON INSPECTION FOUND RIGHT ENGINE NR 2 CYINDER HEAD BROKEN IN THE AREA OF THE FOURTH AND FIFTH COOLING FINS. HEAD WAS COMPLETELY SEPARATED FROM THE BARREL AND WAS HELD IN PLACE ONLY BY THE ENGINE COOLING BAFFLES.