On the inside just below the window you will find a long " ledge" with some type of paneling over it. The window shade cords are attached to screws that help hold this panel in place. It is also stapled. If the owner will allow I would take out those screws and carefully pry up . Underneath is the "beam" that runs the length of the trailer and that the cables are attached to. You don't want that rotted. If that looks ok in that area then you may have minimal damage to outside panel and foam wall but if that has water damage then eventually you are going to have major repairs.
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2201 TL
2010 Nissan Titan king cab SE
4x4
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