Have a duplex 9 stops all front. 2 risers or call them dual , not a ir both cars are identical…. We have repeaters and fire panel. For some reason we lost one riser. Button would lite but not latch, so tried a teach. Now no matter what I am not able to get that 2nd riser up. Have voltage and comm seems to be there. Have not found a way to fire both. Just cause how car 1 master is ,, the car I have to program that side is working, but all circuits are paralleled. Must be a trick to do 2 risers. Tried both on ins tried to separate .