As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS GROUNDED. AFTER TAKE OFF, PILOT AND COPILOT STAB TRIM SWITCHES WOULD NOT WORK UP OR DOWN. AUTO PILOT WOULD NOT ENGAGE. AN EMERGENCY WAS DECLARED AND THE FLIGHT RETURNED TO DFW WITHOUT FURTHER INCIDENT. RESET BREAKER IAW GPM 13.04.7 AND PERFORMED STAB TRIM MOTOR TEST IAW AMM 27-41-71 AND 22-11-81. OPS CHECKED NORMAL, OK FOR SERVICE.