I have an old autohelm tiller unit that I am trying to repair. The circuits are relatively simple but I have no schematics and trying to circuit trace is extremely slow and frustrating. The problem is in one of the semiconductors and I am almost to the point of replacing them all. The unit is called Autohelm 2000 and is manufactured in England probably before Raymarine bought them out. If anyone has schematics or information on the unit I would appreciate hearing from you.