As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER AUTO PILOT DISCONNECT, THE ELEVATOR CONTROL STUCK, AS IF THE AUTO PILOT WAS STILL ENGAGED. IT THEN RELEASED AFTER ABOUT 1 OR 2 SECONDS. (FLT 4711) REPLACED ELEVATOR SERVO ACTUATOR IN REFERENCE WITH CRJ200 AMM. P/N 622-5027-101, S/N OFF 1CJ6C