I'm not that familiar with the six cylinder engine, but looking at the manual, there is a cover on the back end of the camshaft that could potentially leak. But I would think this is unlikely.
Looking at the emission system, the only bits that it seems could pressurise the crankcase is the flame trap and its connecting hoses and the valve to the manifold, and the hose from the breather assembly on top of the intake rocker cover. Both of these would have to be blocked. In some cases people have blocked these deliberately in the mistaken belief that they are reducing performance.
Unfortunately, I conclude though that the most likely problem is that the crankshaft seal is damaged - it looks as if this would be very easy to do during installation!
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