As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ENGINE WAS SENT FOR INVESTIGATION AND REPAIR AFTER THE OPERATOR REPORTED AN UNUSUAL SOUND FOLLOWED BY VIBRATIONS AFTER ROLLOUT. SUBSEQUENT TESTING ON THE GROUND REVEALED THE ENGINE HAD UNUSUAL, HEAVY VIBRATIONS VERY LOW IN THE RPM BAND, BEFORE GROUND IDLE.