What about light fixtures?
We're assuming you're asking about the clue in the message the waiter gave you.
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Where have you seen a light fixture around here?
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Go to Warren's cabin and try turning on the light.
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You need to fix everything around here, apparently. Lacking a meat cleaver, you'll probably need to resort to a screwdriver to unscrew the light switch panel.
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Luckily, there's something else broken around the ship – who knows, maybe a handyman is finally on the job.
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Go to the corridor and the broken lift to "meet" Trevor.
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You will need to distract him somehow.
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Drop your precious coins down the lift shaft and grab the screwdriver while he's investigating the noise.
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Swap and rotate the tiles inside the light switch so that all connections are of matching shapes.
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With the light finally on, turn around to look at the light fixture.
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You'll need a ladder to get the item in there.