As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE IDLER GEAR BETWEEN THE CRANKSHAFT AND THE CAMSHAFT GEAR DISENGAGED DUE TO FRACTURING OF THE CRANKCASE AND ACCESSORY CASE. THESE FRACTURES ARE DIRECTLY OPPOSITE THE CRAN GEAR AND WOULD INDICATE THAT A SOLID OBJECT WENT IN BETWEEN THE CRANK GEAR AND IDLER GEAR. THE UPPER ROW OF TEETH ON THE IDLER, DRIVES THE MAGNETO AND THERE IS ONE TOOTH MISSING. THIS MISSING TOOTH IS PROBABLY WHAT WENT IN BETWEEN THE GEARS.