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In dealing with Ford on my 00 Expy that started rusting after only 3 years, the "corrision warranty" only covers if the panel in question has rusted all the way thru.
I would look into this and see if Ford has changed this.
Hopefully it gets covered by warranty. I know for my truck, its starting the rust under the doors but its very minor yet. Im just gonna shell ou tthe cash for a new paint job for the whole truck before it gets too far gone.