What was found
FLEX PWR SET FOR 50 PERCENT, THROTTLES ADVANCED SMOOTHLY WHEN AUTOFLT SELECTED TO THE APPROPRIATE REDUCED PWR CHEVRON INDICATED SETTINGS ON THEN 1 GUAGE. THROTTLES CLAMPED NORMALLY PRIOR TO 80KTS. AFTER 80 KTS THE NR 3 ENGINE BEGAN NOTICEABLY SURGING WITH NR3 N1, N2 AND EGT FLUCTUATING WITH THE NR 3 THROTTLE CLAMPED AND NOT MOVING. SOON THEREAFTER THE NR 2 AND NR 1 THROTTLES BEGAN RETARDING TO COMPENSATE FOR THE N1 OVERSPEED ABOVE THE CHEVRON. TAKEOFF ABORTED BETWEEN 100 TO 110KTS. REPLACED NR 3 ENGINE FUEL PUMP PER M/M 73-12-01-2. ALSO REPLACED MAIN ENGINE CONTROL PER MM 73-20-01-2, BOTH LEAK CHECK GOOD ON WET MOTOR AND IDLE ENGINE RUN, WILL REQUIRE POWER TEST. COMPLIED WITH MAX POWER ASSURANCE RUN PER JRH AND ENGINE RUN FORM. ALL CHECKS WITHIN LIMITS, OK FOR SERVICE.