As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRFRAME VIBRATION BEGAN FL220 A-P DISC SET TRIM MANUALLY VIBRATION STOPPED. REQUESTED FLT CREW TO COMPLETE VIBRATION SURVEY. PLEASE TROUBLESHOOT ACFT USING TSM05-50-00-201. POSITIVE FIX REQUIRED BEFORE NEXT FLIGHT. REPLACED ALL RUDDER SERVO ROD ENDS.