What was found
DURING CLIMBOUT, NR 1 ENGINE EPR AND FUEL FLOW INDICATORS WERE FLUCTUATING. FLIGHT RETURNED TO MSP AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED THE ENGINE, DRAINED THE F.C.U. MOISTURE TRAP, AND RAN THE ENGINE. NO ANOMALIES WERE NOTED. AIRCRAFT RETURNED TO SERVICE. SUBSEQUENT SIMILAR PIREP RESULTED IN THE REPLACEMENT OF THE F.C.U.