As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE INVESTIGATING AN OIL LEAK, STAINS WERE NOTED ON THE LOWER SIDE OF THE ENGINE CYLINDERS. THE 4 EACH CYLINDERS WERE REMOVED FOR FURTHER INVESTIGATION AND CRACKS WERE NOTED APPROXIMATELY 1.25 INCHES DOWN FROM THE BARREL TO END. THE CRACKS WERE ON THE UPPER SURFACE (PUSH ROD SIDE). THE CYLINDERS WERE RETURNED TO THE MANUFACTURER FOR FURTHER EVALUATION.