As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CYLINDER HEAD SEPARATED FROM THE BARREL COMPLETELY THREE COOLING FINS DOWN FROM THE SPARK PLUG HOLE. THE CYLINDER REMAINS IN PLACE. DUE TO ENGINE ROUGHNESS, A PRECAUTIONARY SHUT DOWN WAS PERFORMED. AD 78-08-07 APPLIES TO THIS CONDITION. SUBMITTER RECOMMENDED INSPECTION FOR BLOW-BY BEFORE EACH FLIGHT INSTEAD OF THE 100-HOUR INTERVAL PER AD.