As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL, THE RIGHT ENGINE WOULD NOT DEVELOP FULL POWER. UPON FUTURE INVESTIGATION FOUND THE ALT AIR DOOR CAME LOOSE AND WAS BLOCKING THE EJECTOR INTAKE. UPON FINDING THIS WE INSPECTED THE LEFT ALT AIR BOX AND FOUND THE ALT AIR DOOR LAYING IN THE COWLING.