A mechanic friend asked for some help. He has a Tac 50, he says it is an 04. he replaced a broken hall button and now the new button is only being seen by one car. He performed a lon download, but the other 2 cars say he has a bad connection, and they stop at that floor in each direction every time they have an up or down demand.Any thoughts would be appreciated, I guess the hall direction tone is bothering the whole office near the hall station.