As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NR 6 CYLINDER BARREL CRACKED 2.5 INCHES UP THE BARREL FROM THE FACE OF THE MOUNTING FLANGE. CRACKED EXTENDED APPROX 330 DEG AROUND THE CIRCUMFERENCE OF THE BARREL. BARREL EXHIBITS HEAT DAMAGE ON THE BARREL IN LINE WITH THE PISTON PIN AND THE PISTON PIN HAS SEVER WEAR ON THE PIN PLUGS. ROD BUSHING WAS BEYOND LIMITS ON THE PISTON PIN. INDICATIONS STARTED AS AN OIL LEAK AND THE PILOT WAS ABLE TO LAND ON AN AIRPORT SAFELY UNDER POWER.