As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON DESCENT AT 290 AND SLOWING WITH AIRCRAFT CLEAN, EXCESSIVE VIBRATION WHEN SPEED BRAKES WERE GREATER THAN 1/2. COULD NOT USE SPEED BRAKES GREATER THAN 1/2 DUE TO MODERATE VIBRATION - MAINTENANCE HAS ISOLATED THE SOURCE TO THE ELEVATORS. OPEN