As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER 2 HOURS OF FLIGHT AIRCRAFT EXPERIENCED INTERMITTENT MEDIUM FREQUENCY VIBRATION SUBSEQUENT INSPECTION REVEALED THE BEARING FAILURE OF NR 2 TAILROTOR DRIVESHAFT. FORWARD BEARING ON SHAFT DISINTEGRATED DUE TO LOSS OF GREASE. BEARING SCRAPPED AND C/W ASB 407-01-44. (M)