What was found
AIRBORNE RETURN TO SOUTHEND, ENGLAND (SNN), DUE TO FLUCTUATIONS ON ENGINE VALUES, NR 1 EPR, NR 1 N1, AND NR 1 N2, NR 1 FUEL FLOW. PILOT REPORT. CARRIED OUT T/S PER BOEING MM 72-00. INSPECTED INLET AND EXHAUST, REMOVED AND CLEANED PS4 MOISTURE TRAP. CREW CARRIED OUT ENGINE RUNS AT TAKEOFF POWER AND SUSTAINED CLIMB POWER. NO DEFECTS NOTED. (X)