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30FF is the inlet manifold pressure not reaching that being requested from the turbocharger. if you did a smoke test and it passed as you say check the boost solenoid, if the needle shakes or doesn't hold 20 inches of vacuum its the solenoid, do the same with the wastegate diaphragm. After that its the CHAR on the turbo.
INSTA diag software has a test plan for this.
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