They do... I tried a few other tests after reading up a lot on other similar problems. Determined to learn how these tick and what to look for in the future, especially after selling my Indiana Jones 10 years ago when I though it was "broken" (dumb dumb dumb). Read a lot of your troubleshooting and guidance... a TON of great info so thank you.
All suspect SRCs tested low pulses. I checked resistance on them and all were good within the 4.7k ohm spec except SRC4 which tested at 2.5k ohm across the pack. Not sure how that will affect the display but most likely will need some attention in the future. I went to test the 7180s on the display so I loosely connected all cables to the display board, booted the game up, and noticed the trouble segments were off and everything was working 100%. So turns out I overthought it all and it ended up being a loose connection somewhere along the display board. Still never hurts to learn how to troubleshoot I guess....
One thing that was a bit confusing along the way was the absence of the referred schematic for the jackpot display. The manual says to "refer to assembly drawing D-12159" but I can't find it anywhere. It looks like this drawing would make sense of how the main displays control the jackpot display.