As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) THE PILOT WAS ON THE GROUND AT FLIGHT IDLE AND ACCELERATED THE RPM TO NR RPM 100 PERCENT. THE RPM REACHED 108 PERCENT FOR 1 TO 3 SECONDS. THE PILOT TRIED TO BEEP THE RPM DOWN BUT NO RESPONSE. THE PILOT BROUGHT THE THROTTLE DOWN TO FLIGHT IDLE. THE PILOT DID A NORMAL SHUTDOWN OF ENGINE. AN ENGINEER WAS CALLED DUE TO A GOVERNOR FAILURE. REPLACED GOVERNOR, DEFECT WAS RECTIFIED.