As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CYLINDER ASSY FOUND CRACKED DURING INSPECTION. LEAK COULD BE HEARD FROM CRACK DURING DIFF COMPRESSION TEST. CYLINDER REMOVED AND LARGE CRACK OBSERVED IN HEAD CASTING (INTERIOR VIEW). THE S/N OF CYLINDER REMOVED IS E41375-4 (TC NR 20070727002)