With the valve above closed, the flow of cold water goes to the right, so the lower half of that Tee will sweat. It is possible that the Tee is not leaking and that the corrosion is just from sweat. If you stop the flow by closing the valve to the right and blow dry the Tee, it should be easy to see if it is leaking or just sweating.
That said, if I were a betting man, I'd say it is leaking.





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