As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON ENGINE SHUT DOWN RT PROP WENT TO FEATHER. ENGINE WAS GROUND RUN AND MAX RPM WAS ONLY 1900. MAINTENANCE REPLACED PROPELLER AND RETURNED AC TO SERVICE. PROP BLADE LATCHES ARE PRESUMED TO BE THE PROBLEM. PROP IS BEING SENT TO REPAIR SHOP.