Lodi, CA
The glow would indicate you have HV to the board. I would really scrutinize the solder joints on the header pins before you go any further.
Reflow any pins that are questionable
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So this is the reference for display repair. http://stevekulpa.net/pinball/bally_disp6r.htm
Test the 100k ohm resistors and make sure they're good. They are underrated for this job and may be open.
It's also time for you to bust out a schematic. Stern's can be numbers different so find a stern schematic of you don't already have one.
At this point once you can verify you have power to the test points (and that it is high enough ~190VDC) then you need to look at the digit enable transistors and the decoder.
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