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We just saw a stain line on the ceiling about 3 feet long and only about 3 inches wide. Also noticed some staining around an air vent about 5 feet away. The moister line is left to right and the stain around the vent is 1/2 way around on the side of the other long stain. I looked in the attic and the roof seems to be dry with no indication of staining from rain. All insulation is dry. Do we call a plumber or an HVAC person?