We have a new duplex using MCE motion 4000 controllers. When Car A is dispatcher the dispatching works fine. If Car A is put on inspection or shut off. Hall calls will not be answered. If Car B is dispatching, hall calls will not be answered. Only if Car A is the dispatcher and Car B is the slave will it work properly. We have checked to make sure the car identifiers are set properly for each car. The can bus is communicating. The power phases to each car match. Jumpers J3 on the MPU boards are in place. Floor assignments are set in the F1 Basic Features menu. Any ideas?