As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRFRAME VIBRATION FELT ON CLIMB OUT AT 3201 CTS AUTO PILOT ENGAGE VIBRATION DID NOT STOP WHEN AUTO PILOT DISCONNECTED. VIBRATION STOP WHEN AIR SPEED REDUCED BELOW 280 KNOTS ALL ENGINE INDICATION NORMAL. REPAIRS MADE TO ALL RUDDER HINGE ATTACH FITTINGS. FUNCTIONAL CHECKED GOOD. THE AIRCRAFT WAS GROUNDED.