As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A CONNECTING ROD BROKE CAUSING SIGNIFICANT INTERNAL DAMAGE. THE CRANKSHAFT, CONNECTING RODS, AND POSSIBLE OTHER COMPONENTS HAVE SIGNIFICATE AMOUNTS OF ELECTROLYSIS SPOTS. THESE ARE QUITE DIFFERENT THAN CORROSION. UNCERTAIN OF THE CAUSE. THE INTERNAL COMPONENTS WERE NOT MAGNETIZED. THE CAUSE OF THE ELECTROLYSIS IS UNCLEAR. ENGINE WAS SENT TO LYCOMING FOR FURTHER ANALYSIS.