As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 2 CONNECTING ROD BOLT FAILED CAUSING CONNECTING ROD TO GO THROUGH CRANK CASE CAUSING MAJOR ENGINE FAILURE. ENGINE DESTROYED. TOP OF BOLT FAILED CAUSING ROD CAP TO BEND BACK AND EVENTUALLY FAIL. THREADED END OF THE BOLT FOUND IN BOTTOM OF ENGINE CASE IN GOOD CONDITION. NO SIGN OF OVERREV COULD BE FOUND IN OTHER BOLTS OR RODS.