How can I know if top relay switch is bad?

[Lil bastard]

Of course you pulled the Red Clip - you'd be surprised how easy it is to forget.

Assuming you have pulled it, my money's on the latch/header microswitch. These easily stick, while the top relays rarely give out.

Take a pencil, chopstick, even a screwdriver (though I prefer a non-conductor) and work it in the hole to make sure the switch is operating properly.