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Turbo Pressure leak



I need some helpful suggestions on finding a boost leak.
On accelerating once the boost got up to about 10 psi I started hearing a loud 
hissing noise like it was in the HVAC ducting!  I expected to easily find a 
loose hose or obviously cracked one.. but when I carefully looked  nothing!?

I can still get about full = 12 psi right now boost pressure so I realize the 
hole isn't enormous.

TIA
Colin
86 5000CD Quattro 302,000km awaiting BBV
Schrapknel Knobben (R)