As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB OUT, AUTOPILOT STOPPED RESPONDING TO ALL PITCH COMMANDS. CREW RETURNED TO DEPARTURE. EMERGENCY DECLARED. MAINTENANCE FOUND A PIN ON THE CONNECTOR TO THE AUTOPILOT CONTROLLER NOT SEATED. LOCKING MECHANISM IN THE CONNECTOR FOR THAT PIN WAS BROKEN AND THE CONNECTOR TO THE CONTROLLER WAS REPLACED.