As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, THE NR 3 ENGINE ROLLED BACK TWICE WITH EGT, N1 AND FUEL FLOW GOING TO BOTTOM OF SCALE. WHEN THE THRUST LEVER WAS ADVANCED, ALL READINGS RETURNED TO NORMAL AND THE REMAINDER OF THE FLIGHT WAS UNEVENTFUL. FUEL PRESSURES WERE CHECKED, THE FUEL PUMP AND FUEL CONTROL WERE REPLACED. A GROUND RUN-UP CONFIRMED PROPER ENGINE OPERATION.