As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE RT ENGINE PROPELLER FEATHERING WITHOUT NOTICE. ENGINE SHUT DOWN AND LANDING WITHOUT PROBLEMS. DURING INVESTIGATION, FOUND PROPELLER GOVERNOR SPLINE SHAFT BROKEN IN TWO PIECES. REPLACED GOVERNOR, RUN UP SATISFACTORY. POSSIBLE GOVERNOR INTERNAL DAMAGE.