My advice is that you are far away from a bunch of mods, as that laundry list is pretty long.

I'm only going to talk aboot the LED situation. Order a couple of each kind to find out what you like. My brother just did some testing and he likes Coin taker Minis in the GI...said ablaze 3s were too much. Here's another issue...if I am not mistaken the GI on that machine are actually STAPLED into place...not screwed in like other companies. So swapping out GI might not be as easy as other machines.

Can anyone that knows address this? do you actually take parts of to get to the GI or do some peopel install a screw bulb socket?

I'll also say this...just resign yourself to the fact you are going to take off most plastics on the game to clean them, and the machine itself. So just get a new set of rubbers for it casue that usually needs to be done and sounds like it for sure in this case. Buy new balls also...no point cleaning a game and putting in crap balls. And you're prob gunna have to take off the subway plastic under the playfield. I bet it's totally filhty and that goes back to having a clean game and running the ball through that filthy crap.

So cleaning supplies - Novus 2 & 1
New rubbers
New balls
sample LEDs

Basically I'm saying to play the game the most you can now....there is a very good chance it's not going to be working for a awhile whilst you fix it up.

EDIT: and TAKE PICTURES of EVERYTHING you do when taking things apart...and then takwe some more...and when you're hand is tired from taking so many pics....take some more.
Trust me.

Getting someone else to work on your game for minor things is so CAVE. Board work sure...but everything else really isn;t very difficult. And it CAN be fun....you can get burned out too though.