One of motor switch 5B's jobs is to release the Eject relay. It's probably gapped too close.

For a switch to work 3 things are necessary:
1) When open, there should be a small space between the contact points (duh)
2) When closing, the long blade's contact point should push the short blade's contact point enough to move the short blade
3) The contact points should be clean, which they usually will be if #2 is happening

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It's a motor switch switch stack, not a relay switch stack

It looks like this. 5 is the 6th one over from the left-they start with 'Index'-and the lettering starts at the bottom of the stack. Loosen the screws a bit to get in and clean.
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Be careful, you’re gonna turn into an EM guy! I foresee baby flippers in your future! Then it’s zipper flipper city!!!!