? Check the vacume pipes, one way is to spark up a fag and remove an end of a vacume pipe and blow the smoke through the pipe if theres a leak you will see the smoke coming out where the pipe is damaged if you get me!!
see can you move the actuator arm goin to the wastegate by hand could be tight from left idle doubt it but try it anyway.
Rite been out at the car for the evenin, i blocked the airfilter pipe and put 2bar of pressure in to the system got a few minor blows tightened clips and that sorted them out no more leaks then started the car and no change at all?????
check the vacume pipe thats goin to the actuator from the boost solinoid on the right turret!!