Try drilling out old screw with left hand drill bit, or drill old screw with small drill bit to start then a little bigger and put in new slightly smaller screw in same hole with a dab of sealant seal around screw heads also and clean and reseal rest of caulking affected
WE have a 2018 Bighorn 3160el had water problems and drilled holes on inside of shower tracks near bottom to let the water back in tub, sealed outside elongated slits and painted black to match rails solved problem for us hope it will help you
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