As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT TO FINAL APPROACH RECEIVED AN AP PITCH TRIM CAUTION MESSAGE. RAN QRH, HEAVY NOSE DOWN WHEN DISCONNECTED. REENGAGED, AP MESSAGE WENT AWAY AFTER RE-TRIMMING. MESSAGE CAME BACK ON SHORT FINAL. REINITIALIZED FCC CARD NR 1 AND FCC CARD NR 2. OPS CHECKED NORMAL. PERFORMED OPERATIONAL CHECK OF AUTOPILOT TRIM SYSTEM. CHECKED NORMAL.