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This is the best I've seen so far.
Besides WUR inlet filter stack clogged up he also lists another failure mode in which the valve body plate and pin were rusted together.
Although he modified the WUR to make it adjustable, might be OK to just dismantle, clean, regrease, rip out inlet filter stack, reassemble, and not to go to the extra effort of tapping out the valve body or pin. Although the WUR is finnicky. One post in a Porsche forum said that just replacing the O-ring in the valve body changed control pressure by 4 psi!
http://forums.vwvortex.com/zerothread?id=4655543
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