SpecFIB18

Last night was the end of it. It was getting worse and worse until finally last night the rubber stripping where the window rides up on had it. I think it was expanding slowly everyday in the HOT Florida sun. My questions are, has this happened to anyone else? How did you handle it? Where should I go to have it replaced? Is it Doable myself? Whats the part#, how much, etc. Any information would help! Thanks!