What was found
NR 3 ENG WOULD NOT ADVANCE TO MAX POWER, EPR OF 1.61, AUTO THROTTLES ADVANCED ENGINES 1 & 2 TO 1.61 EPR, NR 3 STOPPED AT 5% - 6% BELOW 1 & 2. THROTTLE NR 3 STOPPED 1/2 KNOB BEHIND NR 1 & 2. MANUALLY ADVANCED NR 3 THROTTLE UP, EPR & N1 SETTINGS WOULD NOT ADVANCE. INITIATED A LOW SPEED RTO AT 70 KNOTS. ACCOMPLISHED HIGH POWER RUN OF ALL 3 ENGINES, ALL PARAMETERS NORMAL & THROTTLE KNOBS EVEN. RAN ENGINES IAW JRH. IAW POWERPLANT CHECKED NR 3 ENGINE FUEL FILTER, FOUND NO DISCREPANCY. IAW POWERPLANT, PRECAUTIONARY CHANGE OF THE FUEL PUMP ACCOMPLISHED IAW MM 73-12-01-4-2. LEAK & OPS CHECKED NORMAL. RAN ENGINES AGAIN WITH SAME RESULTS. ACFT OK FOR SERVICE.