What was found
ABOUT 4 MINUTES INTO FLIGHT STRAIGHT AND LEVEL NR 1 ENGINE ROLLED BACK TO 74 PERCENT N1 UNCOMMANDED. NR1 ENGINE LOW LIGHT ILLUMINATED. PILOT CONFIRMED PCL WAS IN FULL FORWARD FLY POSITION AND ATTEMPTED TO BEEP NR1 ENGINE UP USING ENGINE TRIM SWITCH, ENGINE REMAINED AT 74 PERCENT N1. PILOT RETURNED TO BASE AND PERFORMED EMERGENCY OEI RUN ON LANDING WITHOUT INCIDENT. MECHANIC PERFORMED INSPECTION OF ACFT AND FOUND NO OBVIOUS CAUSE FOR THIS MALFUNCTION. TECHNICAL WAS CONTACTED AND CAME OUT TO THE ACFT. AFTER CONDUCTING TESTS HE CONCLUDED THE FUEL CONTROL WAS FAULTY. REPLACEMENT FUEL CONTROL DID INDEED RESOLVE THE PROBLEM.