
Mystery Leak
Yesterday I took some drywall off the ceiling and wall (only about 6" on each) because I suspect some sort of leak coming from either the bathroom upstairs or the window isn't sealed properly. Some of the drywall was flakey and had mold but most of it was solid with no mold. Could you tell me the next steps in finding out where exactly the leak originates? I just had the toilet replaced and there is no moisture under the sink which is on the wall where the window is on the next floor up. And there was only a few drops of water in the bubble after I made a pinhole in it. I have attached pics. Could you advise me on the next step I take and what to look for? I appreciate it!