Its a duplex 7 stops. When both cars are above lobby or other lower floor, no cars respond. If we take car 2 out of service then car 1 will respond. I am not sure of the sequence that is supposed to happen, I think we need LJ, LJX but nor sure how the logic works to select the car. I am thinking the problem is with car 2. I can send prints if that would help. Thanks for your time!