As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, THE CREW NOTICED AT 250 KNOTS A PULSING IN BOTH CONTROL COLUMNS. THE PULSE INCREASED THROUGH ANY PITCH CHANGE WHETHER USING THE AUTOPILOT OR MANUALLY FLYING THE ACFT (MORE NOTICEABLE PULSE). THEY RETURNED TO DEPARTURE WITHOUT FURTHER INCIDENT. MX TROUBLESHOT ELEVATOR SYS AND FOUND THE RT ELEVATOR DAMPER BAD. THEY REPLACED THE RT ELEVATOR DAMPER. OPS CHECK GOOD IAW MM 27-30-1 AND 27-30-5.