As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING A 100 HR INSP, DISCOVERED BLOWBY BETWEEN FINS ON THE INTAKE SIDE OF THE CYLINDER. THE CYLINDER WAS REMOVED AND FOUND TO BE CRACKED BETWEEN THE INTAKE VALVE SEAT AND THE SPARK PLUG HOLE. THIS IS THE 5TH CYLINDER THIS YEAR WITH ALMOST IDENTICAL CRACKS.