As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE ANUAL INSPECTION, DISCOVERED CRACKS IN THREE OF FOUR CYLINDERS. THE CRACKS WERE LOCATED IN THE EXHAUST PORT. A CYLINDER COMPRESSION CHECK DID NOT REVEAL THE CRACKS. THE CRACKS ARE ONLY DETECTED BY VISUAL INSPECTION. SUBMITTER RECOMMENDED VISUAL INSPECTION OF EXHAUST PARTS AT 100 HR/ANNUAL INSPECTIONS, AND ANYTIME THE EXHAUST SYSTEM IS REMOVED.