Yeah, physically check each solder joint, then also make sure the balls when they drain are actually making the switch actuate. On my metallica replacement playfield, the trough switch would not register and had to be adjusted.....30 times so it registers a drained ball.

so next time the ball drains and the game does not register, open the coin door and see if you can visually see or use a stick to see if the ball actually made the switch register.

If a ball is in the trough on a switch, it should say closed and register. If it is saying closed then opening back up, even if it is physically closed, there is something going on.

Do you have the manual w/ switch matrix? Could be a bad solder/joint, bad switch, etc.

I have a extra manual at my office but here is how it should be wired for those switches

https://www.ipdb.org/files/2848/Baywatch_Manual.pdf
Page 38

Also make sure the switch is the right part number. if it is not it could have different characteristics.

You can use a DMM in continuity tests to see if you get continuity at a switch leg, to another switch on the row/column and then even at the plug in the backbox

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I hope someone can verify that shooter lane button, it doesn't seem like the led is wired right?

I sold my BW a few weeks ago :/ so I can't help a ton beyond the manual. I think the start button has a light, check that wiring, it should be similar to your shoot button. I just checked my lotr start button and ya the light is two wires, not jumped like that...

WOOT WOOT! go save some lives!