As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED GOOD M.A.P. AT TAKEOFF. TWO MINUTES INTO FLIGHT, M.A.P. DROPPED TO 23 INCHES. THIRTY SECONDS LATER, M.A.P. DROPPED TO 20 INCHES. SUSPECT THIS IS WHEN TURBO FROZE UP AND RESTRICTED EXHAUST FLOW LIMITING ENGINE POWER. SUBMITTER STATED NO PASSENGERS ONBOARD OR THIS WOULD HAVE BEEN AN EMERGENCY LANDING.