As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DESCENT, CREW REPORTED FAILURE OF BOTH PITCH TRIM SYSTEMS. AUTO-PILOT DID NOT DISCONNECT. CREW FOLLOWED AOM PROCEDURES AND RECOVERED BACK UP TRIM. AN EMERGENCY WAS DECLARED AND AIRCRAFT WAS LANDED WITH NO FURTHER INCIDENTS. MAINTENANCE REMOVED AND REPLACED THE HORIZONTAL STABILIZER CONTROL UNIT IAW MM. OPERATIONAL CHECK WAS GOOD AND AIRCRAFT WAS RETUREND TO SERVICE. (SW21200501219)