As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE TAXIING FOR TAKEOFF, OBSERVED SMOKE COMING FROM THE RT ENGINE, ENGINE WAS SHUTDOWN AND SECURED. THE PROPELLER MOVED OUT OF "FINE" PITCH POSITION CAUSING THE ENGINE TO OVERHEAT, CAUSE OF PROPELLER MOVEMENT AT THIS TIME UNKNOWN. THE ENGINE NEEDS TO BE REPLACED.