As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 1797 FLL-SDQ, AIR RETURN TO FLL - DURING CLIMBOUT OF 27,000 FEET EXPERIENCED EXTREME AIRFRAME VIBRATION. AUTO PILOT WAS DISCONNECTED AND AIRCRAFT WAS LEVELED OUT. VIBRATION STOPPED MOMENTARILY, THEN RESUMED WHEN CLIMB INITIATED. PERFORMED CHECK OF ELEVATOR SERVO CONTROLS REF AMM 27-34-00 AND FOUND RT ELEVATOR YELLOW SERVO CONTROL OUT OF LIMITS. REMOVED AND REPLACED RT YELLOW ELEVATOR SERVO IAW AMM 27-34-51. OPS AND LEAK CHECK OK.