As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) WHILE TAXING, PILOT ATTEMPTED TO REDUCE CONDITION LEVER TO "GROUND IDLE" NOTICED SOMETHING DID NOT FEEL RT WITH THE MOVEMENT. PILOT THEN MOVED CONDITION LEVER BACK TO "FLIGHT IDLE" WHERE THE LEVER BROKE. THE PILOT THEN TAXIED THE ACFT BACK TO THE COMPANY RAMP AND SHUTDOWN THE ENGINE USING THE FIREWALL SHUTOFF. ON CLOSER INSPECTION, IT APEARS THERE MAY HAVE BEEN A SMALL STRESS FRACTURE ADJACENT TO A FACTORY MACHINED HOLE IN THE PART.