Roof rail rust help
 

I discovered this today on my 2001 Excursion. I'm short and never really looked at the top. Then I discovered a window leak and now fou d the source. Any ideas would be appreciated.
https://cimg1.ibsrv.net/gimg/www.for...0f337ab858.jpg
It is on both sides but the passenger side is the worst.
https://cimg2.ibsrv.net/gimg/www.for...46ff0ae68e.jpg

Depending on just how deep the rust goes, you might get away with surface cleaning and repainting. If very extensive, you might consider the advice of a good body shop.