My faucet neck was leaking due to a pinched O ring. When I unscrewed the faucet base, pulled it up there are two o rings one was deformed and had been pinched allowing the faucet neck to leak over the back side of the sink every time the water was turned on. Caught this on a plumbing check out on a new to me trailer, dont think the original owner ever even opened the outside kitchen, so I did not have any water damage yet. I'd also pull the drawers out and check all the plumbing.
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