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Have you gone through any puddles of water? I have a 2001 Ford Expedition (actually the dealer has had it for damn near 2 weeks now, but lets not go there). I noticed the same thing in mine.
The first time, I do not recall running through any large puddles, but that is not saying much. They replaced it and it worked fine. However, just before I took it into the shop this time, it did rain quite a bit and I was running through puddles. The next day, I noticed that my horn is not as loud as it was. I can only assume that has something to do with it.