I have a 1984 Eight Ball Deluxe that has been working perfectly for over a year (after some initial electrical work and parts replacement) and the other day I fired it up to find that the right flipper is totally dead. Initial exam showed no detached wires at the switch, which also makes good contact when flipper button is pressed. There is, however, no spark when the circuit is closed. Since it's been over a year since I had to work on this machine, I feel pretty rusty about how to proceed with diagnosing the problem (I was a total novice when I bought the machine and learned a lot but feel like I've probably forgotten more than I ever learned....!). I did clean the contacts - just with a piece of paper so far - and did make sure all wires are correctly attached. Both left flippers work. Any guidance on steps to take to diagnose the issue would be greatly appreciated.

Thanks in advance!