So I have a 1976 Williams Space Mission machine and the machine plays fine, the problem is when it starts up, sometimes the bonus light under 1000 will not light up and it clicks a lot, like the circuit isn't getting through.

I have cleaned the circuit a few times and that has helped, but now the clicking is getting worse and the bonus light for 1000 won't even turn on.

Any thoughts how to fix this?

I have been cleaning the set up relay circuit...now the lights for ball 1, the bonus light, and game over won't even light up.