Quoted from FiatsRUs:There was no 6 v at the node board and Stern provided zero support (no manual, tech support, nuttin').
And they still don't provide *any* support (manuals, schematics, parts lists, etc) whatsoever for any of "The Pin" machines.
I see Marco Specialties has the node 1 boards (520-5321-00) available:
https://www.marcospecialties.com/pinball-parts/520-5321-00
They also have the cpu board: