As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE LOST POWER ON TAKEOFF. POST-SHUT DOWN AND LANDING, INVESTIGATION REVEALED ALTERNATE AIR DOOR CAME OFF ITS HINGES AND WAS SUCKED UP AGAINST METERING ORFICES IN THE VENTURI, PHYSICALLY STARVING THE ENGINE FOR AIR AND UPSETTING THE METERING CAPABILITIES OF THE METERING UNIT. AIRCRAFT HAD 5,000 PLUS HOURS TOTAL TIME.