Re: almost-new single-lever faucet drip
There could be a piece of debris lodged in the faucet, keeping it from closing properly, in which case disassembling and cleaning may cure the problem. While it's apart, inspect the parts and seals for damage. You may need to rebuild (replace inner workings ) the valve. Don't worry, there's only a few parts to replace, regardless of the type of valve. Since this sounds like a designer faucet, you may have to get your parts ****** from the manufacturer because local retailers will only have the most common and popular parts available.
If the leak is under the sink, then it is probably not the valve, it would be a loose hose connection that is probably flexing a little when the valve is manipulated.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!