As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH TO DTW BOTH STAB TRIM CHANNELS AND MACH TRIM DISENGAGED AND WOULD NOT RESET. RECEIVED STAB TRIM AND MACH TRIM CAUTION MESSAGES. CONTROLS FELT HEAVY, FOLLWED QRH AND CONFIGURED FOR FLAPS 45 DEGREE APPROACH. DECLARED EMERGENCY AND HAD AN UNEVENTFUL LANDING. MAINTENANCE PERFORMED AMM OPERATIONAL CHECK OF THE SYSTEM WITH NO DEFECTS NOTED AND AIRCRAFT WAS RELEASED FOR SERVICE.