I am having an issue with my Police Force pinball machine where sometimes when I turn on the machine and start a game everything works great without a single issue and other times when I start a game or even during a game the right pop bumper stops working along with the police car switch; the switch on the ramp that activates the police car. These issues seem to be connected since both always happen together. If one is works, they are both working and vice versa when they are not working. I have replaced the TIP102 on the pop bumper so far and reflowed the solder on the connectors, but I am still having this problem and it is very random and annoying. It doesn't seem to matter if the machine is hot or cold, etc. it seems to be a random occurrence that can happen one game and then I can unplug the machine and start a new game and everything works fine, etc. At this point, I have no idea where I should look next or what I should do? Any ideas on where I should start would really be appreciated.

Thanks for that awesome response!!! I will go thru that today and let you know what I find. I appreciate your help!!!