Can you post a picture of the window frame along the bottom? Not sure what type window it is but there have been posts in the past of water accumulating in the lower track, seeping down between the walls and rotting from inside. If it opens, there are weep holes in the lower track that need to be cleaned out. If its a frame-less, non-opening, remove entire assembly, clean and reseal.
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Now an SOB
Traded Thor for Melbourne Prestige 24NP
2018 THOR Chateau 35SF
Two Labs, Bugsie & Blondie
Blondie passed in 2020 at 5 to Leukemia
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