But you should replace it anyway....
Water can show up surprisingly far from where it actually entered but if it’s showing up at a ceiling light it’s a pretty good bet that it’s a roof leak. Examine your roof closely on your hands and knees. You’ll be looking for cracks in the sealant around every penetration and seam. And, of course for a damaged membrane. The leak might be several yards from where it shows up inside. Fortunately most leaks are not very difficult to spot with a close visual inspection. You should be doing inspections of your roof and sidewalls 3 or 4 times a year. Water leaks are serious killers of RVs. I learned my lesson the hard way and it was a very expensive lesson. Good luck.
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