Verify yourself, but I think all playfield lighting is +5v. The only 12v connections I see are on Node 1 which powers the coin door.

I searched the manual and i believe anything supplied (non coil) from either node 8 or node 9 is 5v.

Again, verify yourself, but that's what I believe to be true.
http://www.sternpinball.com/upload/games/ghostbusters/pro/1959/Ghostbusters_Pro_web.pdf

Not sure if this has been mentioned in another thread, but over on another forum, Dwight made some comments with respect to ghostbusters code:

"We will try to fix bugs when we can. But otherwise you should ALWAYS assume that there will not be a code update for a game that is 1.0 or greater.

With that said, I would like to revisit Ghostbusters, when I can, and my bosses are pretty reasonable in that court."

"I want to be clear. I consider the game to be finished. I think that the game is fun and interesting as is. But there is always room for improvement."

link:

http://tiltforums.com/t/ghostbusters-pinball-rulesheet/1358/306

I've had this happen too. The DMD will show something like "Stay Puft Award Grows" and then the hurry up value will increase. I have no idea #1 what causes the stay puft award to be awarded and #2 why it's called stay puft if it effects spook central.

Same. Any word on when this can be expected? For some reason I thought Stern said Summer 2018.