As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER TAKEOFF CREW EXPERIENCED SEVERE FLIGHT CONTROL VIBRATION PRIMARILY IN THE PITCH AXIS AND SOME IN ROLL, A MECHANIC WAS IN THE JUMPSEAT AND COMFIRMS THE YOKES WERE VIOLENTLY VIBRATING. CAPT REPORTED IT FELT LIKE HE WAS FIGHTING THE AUTOPILOT. AUTOPILOT WAS NOT ENGAGED, AND WAS ON MEL FOR FERRY FLIGHT TO FWA.