My belly pan was plastic cardboard that was installed with nails driven by a bullet so the nails go into the frame.
To remove the nails, use a cats claw and tap a hammer so the nail pries out. It is not easy and if the nail breaks, it’s a pain to get out by drilling a broken nail out of the frame. I replace the nail with a metal self tapping screw. I need to drill the hole slightly bigger to make room for the screw.
Consider cutting underneath the leak and sticking a cam in. My guess is it’s a pipe going into one of the black, gray, or fresh water tanks. There is RV underbelly tape, but that does not work for me and I find gorilla tape batter.
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