Minivator stair lift 900 series simlicity?

I have removed the stair lift to do some maintenance work and now have put it back together but the unit will only operate with the top and bottom covers of the main housing removed which holds the motor,pcb etc once these are put back in place and the micro switches pushed in the unit will not work i would like some advice or an installation manual or some help please thanks in advance.

JudgeJules Sec Engineer
January 2011