As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRFRAME VIBRATION ON CLIMBOUT PASSING FL280 & AT 310KIAS. REDUCED A-S & VIBRATION ENDED. ACCOMPLISHED STEP 1&2 IAW 27-24-00-200 & MM27-34-00-200. STEP 3 COMPLETE MOVING TO STEP 4 & NEXT STEP IS TO REPLACE LT SIDE INBD ELEV SERVO CONTROL IAW MM.