Vacuum is generated by the pump on the R/H end of the cam box,a large pipe goes to the servo,a smaller one goes to the turbo solenoid and then down to the turbo.
turbo solenoid,turbo pressure sensor and glow plug relay are mounted on the right hand plate above the gearbox.take off all the small bore pipe and clean through,they can become clogged.If you have no turbo boost then the pressure sensor,solenoid or pipe are suspect,the ppe from the boost solenoid down to the turbo can be sucked to activate the arm on the turbo to see if it moves,if memory serves this turbo is naturally ON,the vacuum operates the wastegate dump.
so on ballance id be looking at the turbo wastegate vacuum servo/arm and working my way back up to the pressure sensor.,try the suck test on the pipe down to the wastegate first,if it moves good,if not the wastegate is always open,no boost.
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