I had the same problem
a month or so after I got my '00 S a couple of years ago. Same leak in exactly the same place. It turned out to be the cam tower seals. I had bought mine from a p-dealer so they put a short term full bumper to bumper warranty on it. They replaced both sides because they found it was seeping on the other side too. I'm not sure what it would've cost if I had to pay for it. There is a write-up somewhere out there on tightening the cam cover bolts to slow down or stop a leak. Maybe someone can chime in?
sean
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