As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) NR2 PROPELLER RPM BEGAN TO INCREASE AND COULD NOT BE CONTROLLED. THE NR2 ENGINE WAS SHUTDOWN. INVESTIGATION BY MAINTENANCE FOUND THE MASTER ROD BEARING FAILED, ALLOWING THE ASSOCIATED PISTONS TO OVER TRAVEL ON BOTH UP AND DOWN STROKES TO THE EXTENT THE PISTONS WERE DAMAGED CAUSING SEVERE METAL CONTAMINATION, WHICH REACHED THE GOVERNOR DISABLING IT.