I am working on a Thyssen LEV. It has three levels with front and rear doors. The car homes back to the second floor and will not leave. The 2nd floor button always comes back on and stays on. The only way I can get the unit to run is to drift it away from the floor, then let it run down to the bottom landing. Once at the bottom floor it will stay there until I try to run it up. No matter what floor call is pressed(2 or 3) it only stop at 2 and will not leave. I am looking for circuit prints and any other info I can get. I have lots of commercial elevator info to share..Thanks