I think fixing the window seals is more difficult than it looks. A PO put what looks like a silicon sealant at points on the windows where the seal shrank. It does not seem to do anything, so I would not recommend it. We had leaking windows until I used a can of compressed air to clear out the weep holes at the bottom of the frames. I just stuck the tube that comes with the air into the weep hole and pressed the button. It does not much to plug up these drains. We have not had a leak since then -- knock on wood.
Another thought for you is to go to the Airstream site and see if you can find a parts manual for your model. It might show the profile for the seal if you actually need to replace them.
George
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