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I believe there is a TSB out on this...check out the TSB section, and get the dealer to fix it!

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Yes, there is a TSB published for this. However, the fix is not worth bringing your car in. It recommends the use of sticky felt to line the inside of the plastic wire guard. Or, you could just remove the wire guard all together.
My nissan place wouldnt even give me the felt tape to fix it myself. They dont carry stuff like that. So you're better off goin to a craft store and pickin some up.
G'luck.