As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CRANKCASE FAILURE (7TH STUD CRANKCASE) CRANKCASE FRETTING ON NR 2 & 3 INTERMEDIATE BEARING SADDLE THRU-BOLT PADS. THE OIL SUPPLY TO THE NR 2 CONNECTING ROD JOURNAL WAS EITHER CUT OFF COMPLETELY OR DRASTICALLY REDUCED CAUSING OIL STARVATION TO THE CONNECTING ROD BEARINGS. THIS IN TURN CREATED EXCESSIVE FRICTION AND HEAT CAUSING THE CONNECTING ROD TO FAIL AND EXIT THROUGH THE CRANKCASE RESULTING IN A CATASTROPHIC FAILURE OF THE ENGINE.