The attached photos show a water stain on a ceiling and the pealing paint that is directly over that stain and on the wall behind the toilet. Is the wall deteriorated by the toilet sweating? Or is there another problem? The valve itself doesn't seem to be leaking. This has been an ongoing issue,I can see that the previous homeowner patched the ceiling at the same location. How would you approach this? Open the ceiling or open the wall or both? I also plan to insulate the tank regardless. Thank you!