You can use either the car buttons, shown on the panel on the left, or use the call buttons to call the lift to different floors. You can also move your mouse to the top left to show the slider for the front opacity so you can hide it and actually see the workings of the lifts. BTW The other lift is not working because I was too lazy to make both lifts. It includes the nifty sign that says "We'll be back up to speed in no time". If you change the front opacity you can see where it's stuck just a meter or so below CP2.
