I have a leak in my kitchen that rears its ugly head whenever there is severe rain and wind. To the best of my knowledge, it has only happened twice. Obviously, I would like to fix this. In the process, it's breaking down some of the drywall.
This is what the damage looks like
My question is, how do I begin to find where the leak is occurring before I fix the drywall? If I need to hire a contractor, what specifically am I looking for?
Also, does the presence of a patch indicate that the drywall has been fixed before?