Actually the white caps are attic vents, the black cap is sewer vent. Both are easily replaced. Did you hit low hanging branches or something like?
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Definitely the attic vent. I just had to replace mine after a tree branch removed the original one. Easy job after you remove the Dicor.
Even better, the cap just screws on. Easy re3placement.From the looks of it, the vent is fine, just the cap needs to be replaced.