As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUBJECT AIRCRAFT WOULD NOT DEVELOP SPECIFIED BOOST. INVESTIGATION FOUND EXCESSIVE AXIAL PLAY IN THE TURBOCHARGER AND OTHER UNRELATED EXHAUST SYSTEM PROBLEMS. THE TURBOCHARGER WAS RETURNED TO ALLIED SIGNAL AND INSPECTION FOUND A WORN THRUST BEARING.