I had a call today from a veterinarian who has a 1A2 Stromberg Carlson system. One of the sets stopped working and of course I don't have parts. He is close to retiring and does not want to buy a new system. Does any one know where I can get my hands on a 6 button set? It is a 2800 - 5B5 LR00 that is the numbers off the bottom.