The pieces of angle or flat pieces at the bottom on each side might still need caulking , remove screws and take off and recaulk with pro flex caulking you will have to order from RV supply company. You can use this over the existing areas it will adhere to the other caulk. Do not use silicon it will not adhere to the other caulking,water could be coming in around windows or outer edges of slide they on the inside edge , they small metal strips that also screw on . You can put a small bead on the edges. The pro flex comes in different colors.
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