The game plays as it should, and the bonus scores properly only none of the arrows light as it's counting/scoring the bonus. I've drawn green arrows next to the inserts I'm referring to. As the bonus counts down it lights each one individually, and if you have that insert light (pair, flush, 3q's, etc.) it will score that bonus.

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Thanks guys. I've had that stepper unit completely out and I don't see anything inherently obvious. Is there a way to test it via continuity etc?

Thanks you Rolf! This is the furthest I have been yet. The 2000, 3000, and 4000, are lighting now but the 1000 and 5000 still do not light. (I checked the bulbs already).

Fixed! I cleaned the contacts on the bonus disc and the lights started working again. Thanks guys!

Added over 8 years ago: bonus disc = bonus stepper unit (lol)

Yeah. Definitely not the technical term now that you mention it. The contacts on the bonus stepper unit.

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Now that things are lighting I discovered that the 2000 bonus (KK & JJ's) only scores when the playfield is UP. I wish I could understand the schematic enough to know where to look, if any of you wise sages would be kind enough to help me learn I'd love to.