Good question?? When the previous owners had it you could send it there (New York) or a repair center could call and get the schematics, I think? I have a dealer here locally, who is also a good friend, he would take care of any problem. To the point of those who own a "Major" name product ie. Roland, Korg and Yamaha you can go almost any where.
From what I have heard the new distributer (Brooklyn, NY) is reliable and very interested in the support and promotion of the Ketron brand.