Seeking some words of wisdom in a potential problem.

Yesterday arvo I took off quite fast and as I changed through the gears noticed that boost would not push beyond 2 - 4 psi.
Opened the bonnet and had a quick look around and found nothing obvious wrong. ALso noticed I had lost the flutter sound.

Theres no smoke coming out of the car and its running well just not boosting. Turbo is only 3000km old (IHI VF34) and engine is newly built and tuned to 19 psi.

Any ideas as its gonna be a frustrating couple days waiting for my mechanic to be open for business

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96 WRX Wagon
306awhp @ 19 psi