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If you're going up and down the elevator then I think you must have already used the key on the keyhole at the end of the maze. The maze is only one level - the elevator is about half way down a dead end hall - the keyhole is at the end of that dead end. Sounds like you finished that area to me - you're supposed to end up back on the bridge and be able to throw a switch to stop the bridge from tilting anymore.
Wyv
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