To fix a Moen kitchen faucet leaking at the base, you need to replace the worn spout O-rings. Shut off the water supply valves under the sink, remove the handle set-screw with an Allen wrench, and pull off the handle and spout assembly. Remove the old rubber O-rings from the brass body, clean any mineral scale off the surface, lubricate new O-rings with silicone grease, slide them into place, and reassemble the faucet. Callout type="warning" title="Hygiene Warning": Shut off the water supply valves under the sink before starting repairs. Verification: Turn the water back on and test the spout swivel to confirm zero base leaks.
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