As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED UNABLE TO DEVELOP NORMAL POWER AT ALTITUDE. INSPECTION REVEALED 30 PERCENT - 40 PERCENT OF WASTEGATE BUTTERFLY VALVE MISSING. UNIT REMOVED, REPAIRED AND REINSTALLED. ENGINE HAD APPROX 730 HOURS SINCE FACTORY OVERHAUL. BUTTERFLY WAS NORMAL AT THAT TIME. AIRFRAME TT, APPROX 3,600 HOURS. UNABLE TO DETERMINE IF WASTEGATE ASSY HAD BEEN REPAIRED OR REPLACED PREVIOUSLY. NO DAMAGE WAS DONE TO TURBINE, SO POSSIBLY BUTTERFLY MUST HAVE DISINTEGRATED SLOWLY OVER A PERIOD OF TIME. (X)