Cogburn Custom Mirror

Travis developed firmware for us (Cogburn Custom Mirror).They are in what looks like IoT housings. I installed one set and tried to use a common conductor for the isolated inputs. It did not work when I then wired it isolated it would not work. they have comm but no relays pull in. I think I fried it. I am not applying any voltage to the inputs just shorting them. The other mirror I wired isolated out of the box and it works good. I need to order another trans/receiver set and I don’t know how to order them since the are custom. Also If in 3yrs a controller dies I will need a way to order another. Thanks Jim