Having issues with the rollovers -- A, B, C, D and E -- on my Gottlieb Pioneer machine. Previously had worked perfectly.

Rolling over A, B, C and E (but not D):
• Does NOT add 100 points like it should
• Does correctly turn off associated letter lights and
• Does correctly illuminate the '500pt' star-shaped rollovers

While for the letter 'D', the opposite happens:
• Does correctly add 100 points
• Does NOT turn off the 'D' lights
• Does NOT illuminate the '500pt' star-shaped rollover

This has got to all be related, but my question is what component should I clean or tune up first? I've spent hours reading the schematic, and I'm struggling to know where to start.

Side note: the 'D' rollover somewhat regularly causes the 15amp fuse to blow. Pretty sure this is a separate issue than my main problem.

Thank you for your help.

I will look at the 3-5 ball adj. and check for shorts.

I'm not sure I follow your thinking on the other section of the schematic. This portion shows relays that happen to be labeled A, B, C, D and E, but these aren't the same as the malfunctioning rollovers "A" - "E", right?

Yes... two threads.... Sorry. I thought this one had been deleted.