As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) CYLINDER CRACK BARREL FROM HEAD FLANGE TOWARD CYLINDER ATTACHMENT FLANGE UNDER PUSHROD AREA. CYLINDER WAS REMOVED DUE TO LOW COMPRESSION PROBLEM, FOUND CRACK DURING REMOVAL. CRACK LENGTH 2.5". CYLINDER WAS INSTALLED NEW AT O/H AND WAS REMOVED DURING CASE REPLACEMENT AT 585.5 HRS AND REINSTALLED. CYLINDER TOTAL TIME SINCE NEW 1115.6 HRS.