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Clean them with windex. Every opto, not just the trough. Sometimes a dirty opto can cause phantom triggers with other ones. Look at the optos with your cell camera. Or an old digital camera if your phone has an IR filter so they don't show lit.
You should see the transmitter side glow purple.
https://pinside.com/pinball/forum/topic/testing-optos-with-iphone
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Grimsby, ON