It wasn't the PIO board. I now know the unit works fine if it's at the top floor or in the down direction. It just keeps the doors open when it's at the bottom or in the up direction. My problem is related to the "UP" I/o, which is a "common to car". I believe this is supposed to go hi as it gets to the landing then go low to fully cancel the call within the duplex operation. Like I stated before when I shut other car down it starts to work fine. I've tried swapping both PIO boards on each controller as well as every io board on the card racks that could have to do with the issue. Any advice?