Choosed to use foam inside structure holding the window frame. Foam seals off from engine compartement and fills the quite large air gap inside the structure beam. Will cut carefuly with thin knife where the foam touches the window frame so window and frame can be removable from outside, without tearing the insulation.
After doing this it is essential the window does not leak as any water on inside will now leak in to the coach interior and not down thru the structure like before.
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