As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON DESCENT INTO SLC THE A/C PITCHED UP AND GAVE A AP PITCH TRIM & NOSE UP TRIM CAUTION. STAB TRIM AND MACH TRIM DROPPED OFF 3 TIMES. NOTE: WITH AUTO PILOT OFF THE TRIM WAS NOT MOVING AND THE STAB TRIM KICKED OFF. REMOVED AND REPLACED THE HSTCU IAW MM 27-41-01. OPERATION CHECKS SATISFACTORY AT THIS TIME. NO DEFECTS NOTED. S/N OFF: 175.