What was found
ENROUTE CREW FELT SLIGHT ENGINE SURGES, THEN AT 24K, THE RIGHT ENGINE ROLLED BACK TO APPROXIMATELY 44% N1 WITH NO THROTTLE INPUT.. CONTINUED FOR ABOUT 5 MINUTES AND THEN RETURNED TO PREVIOUS POWER SETTING. PERFORMED FUEL CONTAMINATION CHECKS ON THE LT AND RT ENGINES. FOUND FUEL CONTAMINATION AT THE FUEL FILTER AND THEN AT THE FUEL FLOW DIVIDER IAW EMM 72-00-00. REMOVED AND REPLACED THE LT ENGINE FCU, FUEL FLOW TRANSMITTER, FLOW DIVIDER, HEAT EXCHANGER, FUEL FILTER, FLUSHED OUT ALL ENGINE FUEL LINES, AND EMERGENCY FUEL SHUTOFF VALVE. INSTALLED ALL ENGINE FUEL LINES. PERFORMED LEAK CHECKS AND OPS CHECKS WITH NO DISCREPANCIES NOTED. WORK PERFORMED IAW EMM 72-00-00, 71-00-00, 73-10-01, 73-10-02, 73-10-03, 73-10-05, 73-10-07, AND 73-20-01.