What you don't see can hurt you
Stucco crack was allowing moisture to penetrate through ceiling.
An AC wall unit was removed and the area and window was drywalled over. A thermal scan detected not only the hidden window, but also gaps in the exterior stucco and flashing which allowed moisture to penetrate through.
Window was drywalled over. Not only we discovered a hidden window but a trail of moisture intrusion into the wall and floor.