How to track down source of water ingress
I have found using a infrared camera can be helpful in tracking leaks. My biggest headache was a leak that traveled more than 12’ from the point where the water was entering. The FLIR camera I use is a add on to my phone I use the pro model because of the added sensitivity and software. I have identified leaks that we could not see running down the framework. It is handy for evaluating heating and cooling losses and for electrical inspections you can find a bad connection or overloaded circuit by the heat. You may be able to identify the leak without removing the Sheetrock. I don’t have many saved photos but here is an example of a hot wire that can be seen with the cover on. With the water leaks they are green /blue with the standard colors but they show up quite similar to that hot wire. I should mention I have no interest in the FLIR company but this is my 2nd camera I have taken probably thousands of photos and found loose wires both at work and home.