The good news as you have already identified is the playfield and backglass condition are exceptional. Par for the course for this manufacturer.
The bad news is it is a four player EM and has more contacts, in general, to inspect than any other EM pinball out there.
If you want to enjoy seeing your friends to play this game as opposed to work on it go through every single switch and mech on the game.
Inspect each switch and lightly run a point file across every single point.
Inspect every switch for proper wipe and adjust where necessary. There should be very very few switches that will need adjusting.
Look at every single part on the game and inspect it for being complete, set up correct, etc. Look for defects that could inhibit proper game function and correct them.
Do all of the above before you put the game back together and turn it on. Once you've gotten that far start a new thread of issues on the Tech EM group.
The game is worthy of the above suggested effort.