As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NUMBER 1 PISTON WAS FRACTURED AT THE PISTON PIN BORE, RELEASING THE NR 1 ROD AND PISTON PIN ASSY AT THE SMALL END. THE UNSUPPORTED NR 1 ROD AND PISTON ASSY CAUSED EXTREME MECHANICAL DAMAGE TO THE REAR SECTION OF THE CRANKCASE AND CAMSHAFT.