Check the 500 point relay for dirty contacts. I had one on a Jumping Jack a couple weeks ago where it worked fine when you had the PF vertical poking around, you could hit anywhere near it and it wouldn't activate.

Put the PF down and light pounding on the PF produced a lot activation of the relay (I think it was the 50 point one, but you get the idea... not my game so I don't remember exactly how many points were getting scored.)

The thing that was strange though is that the switches were clean and looked gapped correctly, but there was a slight 'bow' in one of them that caused it to not activate 100% - which I think was the source of the issue. Straightened that blade out and regapped and it worked 100%. It was extremely subtle and took over an hour to find, as it was the last link in a chain of isolating all 50 point switches on the PF first, then wondering why the pops had no scoring switches or EOS switches despite having the wires running to them (the eos turned out to be on the relay....)