two lights above the OK? Got a picture with the backglass out?
for the score lights, easiest thing is to manually reset each score unit and step it up. Check light after each step. If lamp doesn't light, wiggle the bulb and swap it with a known good one. If still no good, the usual problem is the wiper finger/rivet connection on the score unit.
all the score units should reset then step up once during the game reset cycle, so check that they do.
the game also has guaranteed score advance. On the reset cycle, all three score units step up once to the 4 level. On the next cycle, all three go to 6, third cycle they go to 8. After that, only zero or one color will move on a cycle. It's possible for the scores to jump more than one level if nobody has messed with the score extra step stuff or in blue button mode.
the red button relay is supposed to keep itself powered until the yellow button is pushed. Take a look and see if it's powered after you reset the machine. If not, check the switches behind the yellow button, the plug connections between head/cabinet and cabinet/coin door, and switch C on the red button relay (manual pages 140/141).
the red button relay should also power when your first turn on the game or when the tilt trip relay is tripped. If it doesn't, you may have an issue with the 60 ohm resistor at schem H12