What I do is put in an adapter into the turbo outlet conection, and pressurize the complete system. You can then soap test every conection intake manifold and cover plate you can look at the cab boost gauge, and check if it is correctly calibrated, you can hook up the scanner and check the Boost preasure sensor and it's readout. You can check the vent tube and see how much blow by you have. You can remove the valve cover, and use a cigarette, I had a package of punks you get to light fireworks, to see which valves seals and guides are leaking. Or use a small hose to you ear and listen for the air leaking. Put it down the oil drain holes and listen for air past the rings.
Just a thought!
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