Check your manual. It will have the wiring for you to make sure the opto wiring is right. And the switch issue sounds like a diode to me. Check your switch diodes on your upper rollover and any switch thats not acting right like the start button and compare to your switch matrix chart.

If you find they are in a common row or column check all in that row/column. Easy to do and you will find your problem right quick.

Shorted diodes cause major havoc in a switch matrix. We will get through that then move on to the non working coil. We need a perfect switch matrix before we move on.

the constant trough and shooter lane firing is an opto issue. Very common in SEGA's and sterns. Usually the reciever led goes first. Replace both LEDS on the trough VUK boards and you are good to go.