I just got my first pin and everything was working when I picked it up. I needed to take the head off in order to fit it through my doorway. Got everything plugged back in and the main board was giving me an error 7 and the right flipper was stuck open.

After some digging I found this thread and it helped me figure out I swapped the black and white molex connectors
https://pinside.com/pinball/forum/topic/space-shuttle-wont-boot-error-code-7-williams-system-9#post-875044

So my question is what do I need to replace? According to the previous thread I need to replace the game roms, the sound roms and the U9. Any recommendations on where I can get a whole replacement set?

Thanks for the link! Shows error code 7