I noticed that there's moisture creeping along a drywall seam in the ceiling in my living room. The spot is cold and feels damp. Our laundry room is in a bathroom right above, but the washer is in a drain pan that seems to be dry.
Should I cut away a piece of the drywall to inspect the source of the leak, or is there something else I can do to find out more information?
Similar questions mostly relate to roof leaking or water in the attic, which is not the same in this case, so I've posted a separate question.