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These appeared as pinholes or shadows on the exterior, that, when probed with a pick or screwdriver tip, opened up to larger holes in the body. This is a section of the roof Swiss-cheesed by rust from the inside. The ideal repair is to replace the panel. You don’t need to be a genius to conclude that a rust-through such as this is not an isolated event, and that it’s only a matter of time before the whole panel disintegrates.