As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM CAUTION CAME ON AT FL340. AS WE DESCENDED, AP TRIM FAILED. EMERGENCY CHECKLIST TO RESET DID NOT WORK. CREW DECLARED AN EMERGENCY. STAB TRIM WAS INOP. FLAPS 20 DEGREES LANDING TRIM AT 3.2. PERFORMED HORIZONTAL STAB ADJUSTMENT/TEST. FUNCTIONAL TEST OF HSTCU PER AMM 27-41-00, ALL CHECKS GOOD.