As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STAB TRIM ACTIVATED NOSE UP AFTER TAKEOFF WITHOUT PILOT INPUT TRIMMING NOSE DOWN STOPPED UNCOMMENDED TRIM. CHECKED PILOT AND COPILOTS STAB TRIM SWITCHES FOR BINDING FREE MOVEMENT. FOUND PILOT AND COPILOT TRIM SWITCHES TO OPERATE NORMALLY. NO BINDING NOTED. SWITCHES NOT STICKING AT THIS TIME IAW AMM 27-40-00. CHECKED FOR MOISTURE CONTAMINATION ON HSTCU. FOUND NO MOISTURE CONTAMINATION. FUNCTIONAL CHECK OF THE HSTCU. OPS CHECK GOOD IAW 27-41-00. R&R HSTCU. OPS CHECK GOOD.