What was found
LEVELING OFF AT FL400, GOT PITCH TRIM ANNUNCIATOR ON PFD. RAN QRH. FOUND BEING TRIGGER BY SPEED. TOO FAST TOO SLOW WITHIN 10KTS. LIGHT COMES ON. DISCONNECTED AUTOPILOT & FOUND TRIM TO BE JAMMED. JAMMED ALL THE WAY IN DECENT TILL APPROX 10,000'. FUNCTIONED NORMAL AFTER. R & R LT ELEVATOR TRIM ACTUATOR IAW MM 27-32-03. UP TO STEP 4.D.(6). R & R RT ELEVATOR TRIM ACT IAW MM 27-32-03. COMPLETED UP TO STEP 4.D.(6). COMPLETED STEP 4.D.7 OF MM 27-32-02, INSTALLED LT & RT ELEVATORS IAW MM 27-31-01. STEPS 4.D.8 THROUGH 4.D.10. PERFORMED STEPS 4.D.(8) IAW MM 27-32-03 & MM 27-32-00. R & R RT ELEVATOR TRIM ACT IAW MM 27-32-03. COMPLETED UP TO STEP 4.D.(6).