As they say, alcohol solves all your problems! Well, most of them. Thanks mrart2u
I cleaned the problematic switch contacts with alcohol and a toothbrush and they are all registering consistently! Especially the pops. I knew I had things aligned correctly and this just confirmed that my contacts were filthy. Especially near all the pop coils. I also lubed up the spinner today and when you hit it with the new flippers, it zooms!
I also solved my insert light issues. Per chrispink25 I checked the column in the lamp matrix.
The spinner lane lights were connector IJ7 pin 6 on the Yellow-Green wire. When I looked at the column I noticed a few other lights that were out, were on the same column. The Shoot Again, Extra Ball when lit for sure. Where the heck are 38, 39, 40 lamps? Are they the outlane inserts? Inlane inserts?
Anyway, IJ4 connector area revealed itself...
The Yellow-Green wire wasn't fully seated in the connector. I shoved it in and voila! Lights on lights on lights. I still need to work through and make sure the logic is checking out. Obviously, I have some board work to do but I'm going to avoid that as long as I can. I need more practice on some junk boards.
I still have a problem with the switch on the right flipper to change the USA rollover lights. I cleaned the switch with the alcohol toothbrush (I need to patent that idea) and I swapped the old diode for the hell of it but it did not fix the problem. So I took a look at the switch matrix here:
So the flipper lane change is on 41. I checked the column and row wires at the connectors on the board. They look fine and seated well. Does this mean I have a problem somewhere on the column or row of switches? What is UPR S/U Sw? Are these the switches behind the rubbers throughout the playfield? Could it be that one of those is stuck on?
I am also having weird issues with the Shuttle Value lamps and outlane "Score Shuttle" lamps. While testing with the ball out, if I hit the pop bumper skirts the aforementioned lamps turn off and on. I assume the pops are not built to function that way. Is that the vibration is triggering something or I didn't do a good job putting my pops back together (grounds and resoldering new diodes)? This same thing happens even on the startup of a game. Random shuttle values and the outline bonus are lit.
As always, any/all help is appreciated. Each time I crack the hood I get a bit closer to a properly functioning game.