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My 2015 238ML has a delaminated (I think) spot in the floor that is directly over my gray tank. The vinyl flooring is lifted and if you get down and tap it all sounds hollow. The area is about 12" x 12" and it seems to be getting worse. No water in this area except the gray tank, but it is below, so doubt it is the cause. Might try to drill a small hole and inject some epoxy down in there, but I don't really know if that would even work. Last Passport I will ever own for sure (not first problem).
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