As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DESCENDING THROUGH 18,000 FT, RECEIVED A PITCH MIS TRIM ANNUNCIATOR. ATTEMPTED TO HELP THE AUTOPILOT BY TRYING TO TRIM THE NOSE UP. DISCOVERED THAT THE PITCH WHEEL WAS FROZEN IN A VERY NOSE DOWN POSITION. AT 13,000 FT USED EXTREME FORCE TO MOVE THE PITCH WHEEL ENOUGH TO LAND. ITEM IS UNDER INVESTIGATION.