Indeed, I found lots of discussions on PCV causing seal leaks and manifold coming off to change them.
I found this following link that provide detailed descriptions on what flows where, how to check for clog, and how to replace without taking off the manifold. I haven't tried it myself tho. Having taking out the ETM, I know its pretty tight down there.
http://forums.swedespeed.com/zerothread?id=117607
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