As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DEFECTIVE PART FOUND DURING A TOP OVERHAUL AT 1785.8 HOURS (ENGINE TIME). THIS ENGINE CYLINDERS HAD NEVER BEEN REMOVED SINCE LYCOMING OVERHAUL. PERTINENT INFORMATION: CRACK IN PROGRESS, 3/4 INCH LONG. WE CAN OBSERVE POROSITY IN THE MATERIAL AT THE CRACK LOCATION. PART KEPT FOR INVESTIGATION.