It was raining yesterday, and I noticed this wall on the upper floor of our house was leaking. The house is quiet old, built in 1886, but it was "flipped" within the past few years and almost everything on the interior appears to be brand new. The exterior is vinyl.
I peeled off the section of paint that had bubbled up to look underneath at the drywall:
I'm very comfortable putting up/mudding drywall, but I've never done anything to the exterior of the house before and it's on an upper level anyway. Is this likely something I can fix myself from inside, or does it need to be fixed from the outside and/or by a professional?