What was found
(CAN) AFTER STARTING THE NR 1 ENGINE, IN PREPARATION FOR A REVENUE FLIGHT , THE CLA WAS MOVED AND THE PROPELLER SPEED EXCEEDED 120 PERCENT. THE FLIGHT CREW SHUTDOWN THE ENGINE. PASSENGERS WERE DISEMBARKED SAFELY. NO FAULTS RECORDED IN ELECTRONIC ENGINE CONTROL/PEC. LOOKING FOR FAULTS IN THE MFC, EXCEEDENCES, ETC. TROUBLESHOOTING ONGOING.