Pull the plastic strip off; push one side in until you get the edge to slide out from under the groove in the metal strip and start pulling it out.
You need to find out why those screws pulled out - possibly a leak from the top of that transition strip causing causing the screws to lose grip due to deteriorated wood? Use a larger screw (seal the hole with sealant/adhesive prior to putting it in) or fill the holes if you can't reuse them, drill new ones and reattach with new screws. First thing is to find what caused the screws to come loose and everything to pull out then address that first.
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Danny and Susan, wife of 56 years
2019 Ram 3500 Laramie CC SWB SB 6.4 4x4 4.10
2020 Montana High Country 331RL
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