What was found
RETURN TO FIELD DUE TO LT ENGINE EPR FLUX. LT ENGINE EPR FLUCTUATED FROM 1.3 TO 1.55. FELT YAW. LINE ACCOMPLISHED VISUAL CHECK OF ENGINE INLET AND EXHAUST AND FOUND NO DAMAGE, ENGINE RUN ACCOMPLISHED AT 1.41 EPR, CYCLED PNEU. BLEED, ENGINE RUN PARAMETERS ALL NORMAL, NO FLUCTUATIONS NOTED, RETURNED THE ENGINE BACK TO SERVICE. ON JULY 15 CREW REPORTED NR 1 ENG SURGED TWICE JUST MOMENTARILY IN CLIMB APROX 300 FT. REPLACED EEC, FMU AND SVA WITHOUT ESTABLISHING ANY PART DIRECTLY RESPONSIBLE FOR THIS INCIDENT.