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The valve cover leak isn't a valve cover leak. The valve covers are actually the top half of the cam towers. It isn't as simple as replacing the gasket on a valve cover, you'll also have to remove the scavenge pump and when re-installing the pump make sure that it is indexed correctly (see the last paragraph of this post). The pump will also require a new o-ring.
Like many things on these cars, it's can be way more complicated than you would think. Boxsters are very different from most cars, so you only want to have it serviced at a Porsche specialist, otherwise things won't be taken care of correctly.
When I bought my Boxster, it would smoke like the Blue Angels during an air show in left hand turns when driving quickly. Turns out that the PO had a mechanic friend replace the "valve cover gaskets", and the mechanic re-installed the scavenge pump incorrectly (meaning it wasn't scavenging at all). It took me a while to figure out what was causing the problem, and I almost sold the car in frustration.
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