As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED INTO DFW. DURING CRUISE AT FL 370, STABIIZER OUT OF TRIM LIGHT ILLUMINATED, FLIGHT CREW ACCOMPLISHED THE QRH PROCEDURES AND REPORTED A COMPLETE LOSS OF ELECTRIC TRIM. THE AIRCRAFT LANDED SAFELY AT DFW WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE TRIM CONTROL UNIT PER AMM 27-41-71 AND ACCOMPLIHSED A ASATISFACTORY OPERATIONAL CHECK.