As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTED LEFT THROTTLE STUCK AT APPROXIMATELY 34 INCHES MP WHEN REDUCING FROM TAKE OFF POWER TO CLIMB POWER. MAINTENANCE INSPECTED AND FOUND THE LEFT THROTTLE BODY LEVER PIN HAD BACKED OUT AND WAS CONTACTING THE IDLE STOP. THE PIN WAS REPLACED AND NO FURTHER DEFECTS WERE FOUND.