As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) PILOT REPORTED AN ENGINE VIBRATION THAT WAS MOST NOTABLE AT 1000-1200 RPM. PROP HAS BEEN OVERHAULED AND BALANCED, SWAPPED FROM A SISTER AIRCRAFT AND TRACKED CHECKED. CARBURETOR HAS BEEN CHECKED, VIBRATION WAS SEVERE ENOUGH TO LOOSEN THE THROUGH BOLTS ON THE ALTERNATOR. DYNAMIC BALANCING IS GOING TO BE CARRIED OUT.