As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ACFT LANDED WITH SNAG OF PROP SURGING 300 RPM IN CRUISE. FOR TROUBLESHOOTING PURPOSES THE PROP GOVS WERE SWAPPED THEN RETURNED TO ORIGINAL POSITIONS, PROPS WERE SWAPPED THEN RETURNED TO ORIGINAL POSITIONS, WITH NO CHANGE TO THE SNAG. UPON INSPECTION OF THE MAGNETOS RT MAG, RT ENG WAS FOUND TO HAVE BROKEN TEETH. O/H MAG WAS ORDERED AND INSTALLED. ACFT WAS GROUND RUN AND FOUND SERVICABLE.