Help with water leak

One of the windows on our motor home has been leaking. I have taken it back to the dealer twice to have this fixed but it is still leaking. The dinette window will leak and the water is coming out the top of the frame. The leak is delayed as it usually leaks the day after it rains. I believe it is weeping in somewhere but I can't figure out where. I doesn't always leak but it seems to leak when we have had a steady rain. I don't want to take it back to the dealer for a 3rd time for a fix. Especially now since I live in Florida and its our rainy season and I don't want the motorhome sitting on the dealer lot with a leaky window. I have the motorhome stored in a garage so the only time it's in the elements is when its being used. Here is a picture of where the leak is on the window. Any ideas on where to look for this leak? I can sheet water on this window and it doesn't leak so I am guessing the water is coming in elsewhere and getting into the window frame somehow.



Its kind of hard to see but in the middle of the picture you can see the dark spot where the water is coming in.