As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3560 - WHILE HAND FLYING PITCH TRIM MOVED DOWN WITHOUT PITCH DOWN IMPUT FROM PILOT. PERFORMED READING OF THE FDR AND VERIFIED THAT THERE WAS NO RECOREDED MOVEMENT OF THE HORIZONTAL STAB. REPLACED HORIZONTAL STAB CONTROL UNIT AND PERFORMED SYSTEM TEST PER MANUFACTURES PRECAUTIONARY RECOMMENDATION. EXTENSIVE FUNCTIONAL TEST FLIGHT COMPLETED AND ALL SYSTEMS FOUND SATISFACTORY. (M)