Welcome to the forums and congrats!
Suggestion: Get a better camera or a steadier hand haha . Seriously LOL.
Can you take a better picture of the connector 3 pics back. It has 4 fuses and 4 yellow loops on the right hand side. The 4 yellow loops connector is what we need more detail of. GI should always be on (or blinking). Have you tried swapping GI bulbs from good to bad just to make sure it's not the bulbs that are out? The backbox has two sets of bulbs... #44 GI bulbs and #455 blinkers (I think there are 6 or 7 of them across the center). Try putting a working one in a bad one's slot. You might get lucky and simply need a few boxes of light bulbs!
Also can you take a better picture of the 2nd pic in your "no diamondplate" reply. Something looks reworked or burned there. may or may not be an issue.
You DEFININTELY need to purchase a multimeter if you want to own and fix issues on your pinball. I wish I had a pinball at 16, let alone my favorite -- Whirlwind. Congrats man!!
Those multiplier lights are all connected to a single circuit board underneath. Can you verify that the Shoot Again light and the Right Spinner light do or do not work? If those don't work, then the problem is likely with the Yellow/Grey wire that's in commong with all 8 of those lights.