As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE FLIGHT THE PILOT EXPERINCED A SEVERE VIBRATION IN THE TAIL ROTOR. UPON RETURN TO BASE, IT WAS DISCOVERED THAT THE TAIL ROTOR BLADE HAD A TIP WEIGHT MISSING. THE TAIL ROTOR BLADE HAD BEEN REPAIRED IN JUNE 2007 AND HAD ACCUMULATED APPROXIMATELY 205.8 HRS SINCE REPAIR.