Best way is either by sight or feel. Can you see the plumbing at all? If you can, run hot water for a while (which expands the plumbing) and look for drips at both the glued and coupled connections. A coupling (P-trap) may be expanding enough to cause a leak. See if you can tighten it a little by hand. If it's a glued joint, and you're still under warranty, let your dealer fix it. If you can't see all the joints under there, put a tissue underneath each one, and then run the hot water. Where there's a wet tissue, that's the trouble spot. Good luck, and post what you find.
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