Leak at window - Event Date: 10 Dec 2012

We have not taken the Pod out on many trips this summer, but Autumn is our favorite time to camp.  I noticed some staining running down the wall below the rear drivers side window.  On closer inspection, it appears that there has been some water leaking.  The wall has some bubbling and a number of small sharp bumps.  I checked the outside seal as well as the seal along the roof and can find no place where water is clearly leaking.  Any ideas?

I checked the drain holes and they are clear.  It is the emergency exit window, so I popped it open and the inside of the frame is clean and does not appear that water was in there.  It looks like the water is coming from under the window frame.  We are thinking about caulking around the outside of the window.