As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A 100 HR INSPECTION DISCOVERED BLOWBY BETWEEN FINS ON INTAKE SIDE OF THE CYLINDER. THE CYLINDER WAS REMOVED AND FOUND TO BE CRACKED BETWEEN INTAKE VALVE SEAT AND SPARK PLUG HOLE. THIS IS THE 4TH CYLINDER THIS YEAR WITH ALMOST IDENTICAL CRACKS.