As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, ENGAGED AUTOPILOT AND AUTOPILOT TRIM LIGHT ILLUMINATED. DISENGAGED AUTOPILOT. TRIED USING ALTERNATE TRIM MANUALLY. NOSE DOWN WORKED, BUT NOSE UP DID NOT. MAINTENANCE FOUND ALTERNATE TRIM DOWN LIMIT SWITCH INOPERATIVE. REPLACED SWITCH.