Related to grounding your pin and restoring your playfield. Vid1900 has guides for both as well as other guides which are very helpful.
Good luck. It's a cool machine.
https://pinside.com/pinball/forum/topic/replacing-line-cords-plugs-wall-sockets-vids-guide
https://pinside.com/pinball/forum/topic/vids-guide-to-ultimate-playfield-restoration