My lateral tilt for my flexhead works fine when it is in the down position, but when I raise my header the left side of the head wants to tilt down and when I raise the header until the control box kicks out, the header tilts down to the right. I have checked the sensors and they seem to be good. The sensor on the throat that is suppose to level the head when raised doesn't seem to work properly - I have replaced that sensor but it didn't help. Any advice??