Score relays are the most used relays in a game. If you get a new game and your scores don't seem like they are working properly, and your chimes are not activating when they should, look at your score relays. It's a good idea to clean and adjust these if the game has been in storage. May fix a scoring or chime problem.
All relays are important, but the next ones I would clean would be the pop bumper relays. These relays have contacts on them that drive your coils, so the game operates well. Clean contacts at the pop bumper spoon, and relay can make a BIG difference in game play.
And let's not forget the flipper button contacts and end of stroke switch at the flipper coil.
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