Quoted from Rum-Z:
I swear George Gomez said that Stern would be releasing schematics on Spike node boards way back during Expo 2017 or something. I just remember reading this in passing and not paying too much attention to it other than thinking "Good". However, so far nothing has happened in regards to schematics, which makes me think that Stern has back tracked on this comment by Gomez, as they'd rather sell new boards at insane mark-ups than have schematics out there that might assist people in making their own repairs (if people are brave enough with surface mount work) or assist competitors in making more cost effective aftermarket replacement boards.
Someone has got schematics on them, as it would seem that Stern employees designed them and then supplied them to a board manufacturer that made the boards.
also no recovery SD card images or even an basic os image that load game code from usb.