This is something I've been trying to locate for weeks now. I need a main PCB for an SD45 I'm rebuilding. I've called Navin with no luck. Lewis said he'd try to look into it. I think I could use a main board from a Dash 9 or GP40 but as of now no one seems to have any. I would buy a used unit that is damaged or dead just to part it out.I know it's kind of bold to ask but does anyone have or know of any available any where.