What was found
AFTER TAKEOFF AND BEFORE REACHING CRUISE ALTITUDE, THE PILOT NOTICED THE ROTOR RPM AND ENGINE NR 1 N2 WERE ON THE HIGH SIDE (RED LINE) AND ENGINE NR 2 N2 WAS IN THE GREEN ARC. ATTEMPTED TO LOWER THE RPM'S BY USING THE BEEP TRIM SWITCH, BUT COULDN'T GET THE RPM'S TO LOWER. DEDUCED AT THIS TIME THAT THERE WAS A GOVERNOR PROBLEM WITH THE NR 1 ENGINE. ELECTED TO RETURN TO DEPARTURE. REDUCED THE NR 1 ENGINE THROTTLE BACK TO FLIGHT IDLE WHICH LOWERED THE RPM'S TO A MANAGEABLE LEVEL, AND PERFORMED A RUNNING LANDING AS PRESCRIBED IN THE FLIGHT MANUAL. THE MECHANIC TROUBLESHOT THE PROBLEM AND FOUND THE NR 1 GOVERNOR OUT OF ADJUSTMENT. ONCE THIS SYSTEM WAS ADJUSTED TO SPECS IAW MM 65-15 & 65-16, THE SYSTEM OPERATED WITH NO DEFECTS. THIS AIRCRAFT RETURNED TO SERVICE.