I've only been messing with pinball machines for about 4 years, but I've learned alot in this forum asking questions of some pretty smart people here. And I learn alot trying to help people, thinking my way through the schematics. Hopefully, I won't lead you astray, but if I do, there are people watching this who are better than I am at repair, and they'll step in and correct me.
OK, so let's talk about that scoring problem with the lit vs. unlit rollovers. I don't have your machine, so I'm trying to figure out the rules from the schematic, but hopefully this will make sense. This first schematic snippet below shows the 2 relays that give you different scoring when your rollovers are lit or unlit. They are the F and G relays - they both give you 500 pts., but the G relay (as its name implies) adds to your bonus as well. Which rollover activates which relay is determined by a few other relays, but let's look at the A relay for now.
The A relay is the alternating relay and you can see in this part of the schematic, there are 2 m/b A switches that control which relay (F or G) the right side rollover #1 through #6 activate. The A relay is either activated or not at any given time, and the switches on it (labeled A on the schematic) change states when the A relay activates or deactivates. So those 2 m/b A switches are in one state - let's say the state they are when the schematic is drawn. If the A relay then changes states, so do it's 2 switches that you see below.
So in the snippet below, as it's drawn, if you'll follow the red path, the #1, #4 and #5 right side rollovers when closed will complete a connection through the normally-closed (n/c) Motor 1C switch in the bottom right of the snippet, through the closed side of the m/b A switch, through the n/c K and O switches, and energizes the G relay for 500 pts and an added bonus. I've traced this path in red. I'm going to assume that as the schematic is drawn, the #1, #4 and #5 rollovers are lit - because you're supposed to get a bonus.
At the same time, along the green path, the #2, #3 and #6 right side rollovers when closed will complete a connection through the same n/c Motor 1C switch, through the closed side of their m/b A switch and through the F relay, activating it, and give you just 500 pts. No bonus on that one....so I assume those rollovers must be unlit.
By the way, in another part of the circuit, the A relay is controlling which rollovers are lit, and which are not.
300 rollover scoring F & G relays (resized).JPG
The F and G relays don't actually add the 500 pts. - they just provide a path to allow that to happen when they activate and close a switch. That part happens in the snippet below:
300 M relay circuit (resized).JPG
The M relay is what fires the 100 pt score reel, so in this part of the circuit, the F or G relay firing, closes a switch to start the score motor turning, which makes the Motor 1A switch close and open 5 times (think of it as 5 pulses), and those pulses make it through whichever switch (F or G) is closed, firing the M relay, and thus the 100 pt score reel, 5 times for 500 pts.
So your problem, if I understand it correctly, is that the lit rollovers are not scoring. That sounds like either the G relay isn't firing, or if it is, the switches on it aren't all working correctly. We'll have to figure out what's going on. A good place to start would be to observe whether or not the G relay is pulling in when you close a lit rollover switch.
The unlit rollovers are scoring, so we know the Motor 1C switch in the first snippet must be closed since that switch is shared by both F and G relays. So that leaves you the possibility that the A m/b switch, the O or the K switches are not working as they're supposed to. Or your G relay could be no good - that's less likely, but still possible.
Use the wire colors to identify whatever switches you're looking for. Good luck!