As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CRANKCASE SPLIT FROM NR 6 CYLINDER HOLE TO OIL FILLER HOLE ON TOWARD TO THE FRONT OF THE CASE. THIS OCCURRED IN CONJUNCTION WITH THE CYLINDER MOUNTING STUD IN THIS IMMEIDATE AREA FAILING. THE CIRCUMSTANCES UNDER WHICH IT OCCURED WERE 'NORMAL OPERATION'. SUSPECT CAUSE - OVERTORQUEING OF SAID CYLINDER STUD BOLT.