nice find. you are going to have fun getting that backbox back on

- I got mine from a guy who had it in his man cave for 15 years and had barely played it! It was lovely.
before you do anything - do this ASAP.
Get the translite off an check the batteries on the CPU board and make sure they aren't leaking all over the mainboard.
Things to check on Star Trek TNG:
1: New balls,
https://pinparts.co.uk/products/chrome-steel-pinball
2: Drop target at the top for the Borg lock, worth buying a couple of spare of these as they tend to go regularly.
https://pinparts.co.uk/products/single-target-drop-down-arm-left-ij-nf-sttng-t2-jm
3: Cliffy on the Neutral zone hole, depending on the state of the ramps worth considering the ramp cliffies if there are any small cracks.
https://www.pinball.co.uk/spares-accessories/neutral-zone-protector/
4: new rubbers, on this game titan's make all the difference - please don't wreck the game with jelly rubbers !
https://www.pinballshop.nl/playfield-parts/rubbers/flipper-bands/titan-competition-silicone-rings/
5: Flipper rebuild (top priority)
https://www.pinball.co.uk/spares-accessories/flipper-rebuild-kit-1991-1999-a-13524-8/
6: Cabling of the turrets is often stretched just keep an eye out on it.
https://www.pinball.co.uk/game-specific-parts/star-trek-tng/cannon-looms-for-star-trek-tng-h-17067/
7: Pinbits outlane extenders, allow a bit more of a forgiving nudge to keep the ball in play.
https://www.pinbits.com/index.php?main_page=product_info&products_id=306
8: Get foam cleaner from Phil to clean up:
https://www.pinball.co.uk/spares-accessories/foaming-spray-cleaner/
9: Then get some silicon free carnuba wax and wax the playfield like you'd ax your car. Halfords. get an applicator to put it on and take it off.
options:
6: Color DMD is a must for this game
7: mirror blades (talk to Chris B Pinballs he might have some)
8: pin sound but ONLY if you replace the speakers otherwise its rubbish.
9: Personally LEDs are definitely worth it on this.
If want to have a look at mine I'm just down the road from you, out of town until Friday though!
Neil.