As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMB FROM CVG AT 250 - 280 KTS. F/A REPORTED VIBRATION IN AFT OF AIRCRAFT. VERIFIED BY F/O. NO CHANGE WITH CHANGE IN AIRSPEED, ON DESCENT F/A NOTICED VIBES, SIGNIFICANTLY REDUCED AIRSPEED BELOW 250 KTS. REPLACED LEFT AND RIGHT ELEVATOR TABS.