What was found
AFTER T/O PROIR TO POWER REDUCTION LT ENG SURGED 1.3 TO 1.9 EPR FOR 30 SECONDS, THROTTLES STEADY, ALL NORM UNTIL TOP OF CLIMB, AT LEVEL OFF, THROTTLES STEADY, SMALL SURGE 15 SECONDS, LATER IN CRUISE SMALL OSCILLATIONS IN EPR FRM 1.28 TO 1.30. DIVERTED TO ORD. THE 3.0 BLEED ACTUATOR WAS TRIMMED FOR A SIMILAR DISCREPANCY. DURING TRIM, A PROBLEM WAS ENCOUNTERED WITH THE ACFT WIRING FOR THE TRIM EQUIP. THE 3.0 BLEED ACTUATOR WAS FOUND OUT OF TRIM AGAIN. THE EVBC WAS ALSO FOUND OUT OF TRIM. AN EXTERNAL WIRE HARNESS WAS USED FOR TRIMMING, DUE TO CONCERNS OF THE RELIABILITY OF ACFT WIRING. BOTH COMPONENTS WERE TRIMMED. THE 3.0 BLEED ACTUATOR AND EVBC WERE REPLACED PRECAUTIONARY.