As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT ENGINE RAN ROUGH AND VIBRATED BADLY IN FLIGHT, SHUT DOWN. VISUAL INSPECTION FOUND OPEN HOLE IN BACK OF CRANKCASE. IDLER GEAR SUPPORT PIN MISSING. FOUND PIN ON ENGINE NACELLE FLOOR UNDER ENGINE. NO VISUAL DAMAGE NOTED TO PIN. ENGINE NEEDS PIN TO HOLD IDLER GEAR INSIDE OF CRANKCASE TO RUN ACCESSORIES. PIN FALLS OUT, GEAR WAS LOOSE WITH NO SUPPORT INSIDE BACK OF CRANKCASE.