Good question and .... answers as well, I reckon. Am in N.E. PA due to circumstances beyond our control. Started seeing darker lines across the ceiling inside, and on the upper sides, inside, After snow sat on roof for a few days, told DW I don't think it is from moisture, it hasn't shown a spreading pattern.... Have all snow removed at present, from toppers too. Was not easy with one arm in cast, but one must do what one must do. Fridge was steadily warming too, coolant mixture gelled, turned off for a few days, covering vents outside with towels and now working great.....
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