#1 is the williams reset issue. The capacitors and/or bridge rectifiers on the power driver board are aging and not providing clean power. This may be resolved by getting a daughterboard (https://pinside.com/pinball/forum/topic/announcing-new-product-to-help-resolve-resets-in-wpc-era-games). And/or if you are confident in your desoldering / soldering skills, you can replace the 5 axial caps and 4 bridge rectifiers on the power board.

#2-#6 - If it was working, don't worry about redoing wiring for now. It's not causing you any issues. If/when those coils break down, you can deal with it when you replace them.

#7 - you can find rubber replacement kits on ebay.

Before you try #1, pull off the short ribbon connector between the CPU board (left board) and the big Power Driver Board (large righthand side board), then immediately reinstall it. Pull it off again gently, then reinstall it. A lot of times the reset issue is caused by corroded connectors, and you don't have to mess with the board. DO NOT remove the bridge rectifiers or caps until you diagnose which one(s) are bad, because it is almost definitely not all of them.

#2-7 Yes agree with above

for rubber replacements, go to Pinballlife.com, way cheaper than Ebay

I recently went through this, you could check tips on that thread:

https://pinside.com/pinball/forum/topic/wpc-reset-advice

Doesn't hurt to check the thermistor, but more likely J101 I imagine.

If it were me, I'd fix up those wiring connections first, and also check for broken/missing diodes. In researching my problem, I read accounts of things like that causing power strain / drain that can cause resets.

www.Kahr.us
It’ll solve your reset issues

Naphtha. You need to get rid of anything and everything that’s on that playfield, and Naptha cuts grease, wax, dirt... open a window if you are concerned with the smell. naptha evaporates super quickly so even if you are thorough it won’t take long. (Keep the cap on the tin!)

You’ll get a million responses about wax. “Pure” carnuba (no wax is actually 100% carnuba) is best. Don’t use anything with silicon in it at all. Nothing fancy for a car like Meguiar’s or Turtle Wax, I’d order blitz wax or something similar.

Awesome and welcome to pinhead status!!!

Make sure to replace those AA batteries asap. Ultimately you'll want to relocate the battery pack somewhere off the board, or install an NVRAM chip (which would allow you to eliminate the batteries entirely)... Good luck with your game!

I would suggest nvram no batteries no worries!!! Maybe get some coils ordered and sleeves. You will be looking at rebuilding some flippers soon and fixing that coil that is blown out and has the fancy soldering job on it lol. Pic with the busted part looks like a broken coil stop. Can you take a couple pics of the other side of that coil that has a busted wire. Looks like it is rigged up with a piece of wood.

It does have the upgraded flipper kit on it. But it looks like they used the original coils back on it.
https://pinside.com/pinball/forum/topic/vids-guides-collected
Here is vids guides which I follow 90% of the time! The spring on the flipper coil with no wrapping looks funky but will prob work for a time, but it is going to break sooner or later.