Most of those things are held on by metal brackets every couple/few feet. Just pull it off and you'll be able to snap it back on afterward with a little bit of logic and care. But for the record, it's pretty unlikely that the faucet handle is the problem. If it's pretty covered and hard to get at, chances are slim that it was screwed with to begin with. I suggested it because I thought there was a possibility that there were kids around that may have fooled with it. If that's impossible, then risking damage to the metal cover is probably not worth your while.
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