What was found
(CAN) ON 24-AUG-2013, DURING THE ENROUTE CLIMB PORTION OF THE FLIGHT, THE NR 1 PROPELLER WENT INTO AN OVERSPEED CONDITION. THE CREW CONDUCTED THE QRH MEMORY AND CHECKLIST DRILLS IAW THE PORTER SOP, INCLUDING AN IN-FLIGHT SHUTDOWN OF THE AFFECTED ENGINE. THE SINGLE ENGINE APPROACH WAS SAFELY FLOWN AND THE ACFT ARRIVED AT THE GATE WITHOUT FURTHER INCIDENT. 24-AUG-2013 ROUTINE DEPARTURE FOR FIRST FLIGHT OF THE DAY. NO ISSUES, NO MEL`S, FLIGHT WAS CLEARED TO FL240, THROUGH 17000 FT. CAPTAIN AND F/O HEARD AN INCREASE ENGINE NOISE SIMILAR TO AN ENGINE SURGE. THEY NOTICED A SMALL FLUCTUATION OF TORQUE. SECONDS LATER A PROPELLER INDICATION OF 1060 TO 1080 AND ASSOCIATED PEC NR 1 CAUTION LIGHT WITH THE MASTER CAUTION. F/O ADVISED OF A PROP OVERSPEED ON NR 1 ENGINE WITH ASSOCIATED PEC. ATC WAS CONTACTED AND A REQUEST TO RETURN TO POINT OF DEPARTURE WAS MADE AND EMERGENCY WAS DECLARED. SUCCESSFUL SINGLE ENGINE LANDING WAS ACHIEVED. THE NR 1 PEC, PROPELLER ELECTRONIC CONTROL, INFORMATION WAS DOWNLOADED. 3 FAULTS WERE LOGGED: 260, 236, AND 122. IAW THE FAULT ISOLATION MANUAL TASK 61-20-06-810-818, THE PEC WAS REPLACED. A RETURN TO SERVICE ENGINE RUN CHECK WAS COMPLETED ON THE EVENING OF AUGUST 24. THE ACFT IS RELEASED AND WILL BE READY TO RETURN TO SERVICE.