Edit: i misread your post! Sorry good news is you're in good hands here

Sounds like your voltage is good at the coil.

I think he's suggesting that grounding the transistor will be an efficient way to test the connector, wiring, coil etc. To do it, you'll need a wire with an alligator clip on at least one end. Clip the alligator end onto the metal tab on the transistor that fires the coil. The other end of the wire can be *briefly* touched to ground to fire the coil. There's usually a metal ground strap running from the backbox to the cabinet--that is a suitable spot to touch the wire for ground. If the coil fires when you do that, you know the wiring and coil and connectors are good, but it doesn't rule out the transistor itself. I don't have any of my games opened at the moment, but here's where you'll need to hook up the clip:
IMG_20190608_090520.jpg

Does it reset in coil test? Have you tried grounding it's associated TIP transistor?