As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, NR 4 ENGINE INDICATED LOSS OF THRUST. THRUST LEVER MOVEMENT CAUSED ALL ENG INDICATIONS TO FLUCTUATE. ENG NR 4 LEVER WAS REDUCED TO IDLE AN INFLIGHT START IAW COMPANY QRH PROCEDURES DURING DESCENT. S/D ENG NR 4 AS PRECAUTIONARY MEASURE DUE TO UNCOMMANDED THRUST INCREASE, EIDS SNAPSHOT WAS TAKEN OF ENG FLUCTUATION. ENG WINDMILLED FOR 30 MINUTES, OIL PRESSURE AT 10 PSI. REPLACED FCU/FUEL PUMP.