As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT FROM DFW TO MTY, CREW RECEIVED A STAB TRIM FAILURE. CREW DECLARED AN EMERGENCY AND RETURNED TO DFW. AIRCRAFT LANDED SAFELY. MAINTENANCE FOUND NO FAULTS LOADED IN THE HSTCU, FOUND PILOT TRIM DISENGAGE SWITCH JAMMED. MAINTENANCE REMOVED AND REPLACED THE HSTCU AND TRIM DISENGAGE SWITCH. OPERATION CHECKS WERE GOOD. AIRCRAFT RETURNED TO SERVICE.