As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PILOT REPORTS THE INABILITY TO THROTTLE BACK THE LEFT ENGINE. UPON INSPECTION OF THE LEFT ENGINE, NOTED THE NR 2 RAM CYLINDER (PN TISN71.2BCA221) HAD SEPERATED. THE CYLINDER HAD SEPARATED AT THE TOP OF THE BAREL WHERE THE HEAD AND COMBUSTION CHAMBER MEETS. NO DAMAGE TO THE AIRCRAFT WAS NOTED AT THE TIME OF INSPECTION. CYLINDER WAS REMOVED AND REPLACED AND THE AIRCRAFT/ENGINE RETURNED TO SERVICE. CAUSE OF DEFECT UNKNOWN.