As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER TAKEOFF WITH AUTOPILOT SELECTED TO CAPTAIN'S SIDE, TRIM FAIL ILLUMINATED ON MAP MOMENTARILY, BUT THEN EXTINGUISHED. AUTOPILOT WAS ENGAGED; ON DESCENT PLANE PITCHED DOWN AND LIGHT CAME ON AGAIN. REPLACED TRIM PROXIMITY RELAY K0393. BOTH AUTOPILOT FLIGHT DIRECTOR SYSTEMS OPERATE NORMALLY PER MM 22-11-00.