We have our 2016 Axis 24.1 at our local RV repair shop. Wallpaper about 5" below both driver and passenger windows was rippling. Moisture meter showed extreme moisture in that area.
They removed both widows and inspected but it appears it is where the front cap meets the main body on the sides is where the moisture was entering and traveling down the aluminum channels at the rear of the windows. The wood directly under the windows, a few inches down at least, was completely dry.
I'll post again when the job is done. $$$$ Extended warranty does not cover leaks.