As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VIBRATION AT SLOWER SPEEDS, GREATER INTENSITY DURING MANUVERING AT HIGHER ANGLE. WENT AWAY AT HIGHER SPEED, VIBRATION RETURNED DESCENDING FL 320-2 70 WITH SPEED INCREASING TO 300. LEFT TURN SLOWING TO 210 NOTICABLE VIBRATION. VIBRATION DIMINISHED AT FLAP 5. DID NOT FEEL VIBRATION AFTER GEAR EXTENSION.