<span class="Apple-style-span" style="font-family: Arial; ">Ijust purchased a used 400 , I have not gotten it off the ground yet but have fired it up with training gear. With the motor unwired I was checking the servos because the previous owner said he could not fly it. I noticed the tail servo does not return to center position when you let go of the stick. It can be moved by moving the stick though. Is this a setting in the radio or a bad servo ? It does not appear to be a trim problem.</span>