[s-cars] boost/air leak coming from crankcase breather area

[Bill Clancy]

Sometimes I can hear a small air leak when under boost.   I think it is coming from the crankcase breather to intake manifold connection or the check-valve.   
http://pictureposter.audiworld.com/100685/dsc02521.jpg
    
In the Bentley diagram (link below) this is the area of items 5, 6 and 7.
4 - Evaporative Emission (EVAP) canister purge regulator valve -N80- 
5 - To connection on intake manifold, lower Throttle Body (TB) flange 
6 - Check-valve 
7 - To crankcase housing breather 
http://pictureposter.audiworld.com/100685/fuelinjection-components.jpg 

Has anyone had this problem or know what parts to get and how to replace this stuff?  The clamps are crimp-ons.  And it's not easy to get in there.