You need to caulk all along the top of the molding strip too. It may look good but it is not. I just fixed my mystery leak by doing just that. The caulk looked to be in good shape but was not. I was getting a lot of water in the house.
Mine was on the kitchen slide and I fixed fridg vents, stove vent, screws, etc. All good things to check and fix but nothing stopped it till I caulked that strip.
Good luck
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