TDI 75 not warming up and losing power

Yes the N75 is operated by turbo pressure and indeed not vacuum. Pressure from the turbo enters the N75 from the green coloured braided pipe ( where can I get more green braided pipe? ) the valve then rapidly switches this pressure between the waste gate and the vent into the air inlet to regulate the boost. A small hole can cause all sorts of problems and in my case I changed all the braided pipes. The braided pipes link lengths of quite rigid plastic small pipes to and from the turbo, actuator and valve.
 
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