As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUR NEW CYLINDER ASSEMBLIES WERE INSTALLED. AFTER GROUND RUNS AND 1 BREAK IN FLIGHT THE ENGINE WAS INSPECTED. DURING THE INSPECTION THE PUSHROD TUBE SEAL WERE FOUND TO HAVE LARGE CRACKS AND SPLITS. THE SEALS AND GASKETS WERE SUPPLIED WITH THE CYL KITS FROM MFG. THE TT ON THE SEALS IS LESS THAN 2 HRS.