As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT 3465, NR 4 ENGINE WENT TO SUB IDLE-CREW SHUTDOWN ENGINE. NR 4 ENGINE APPEARED TO GO INTO SUB IDLE, ON APPROX 15 MIN FINAL. THE GEN FELL OFF LINE AND ENGINE NR 4 AIR VALVE ANNUNCIATORS CAME ON. THE N2 INDICATED 37 PERCENT AND EGT 433 DEGREES. THIS WAS WITH THE THRUST LEVER ABOVE 50 PERCENT TRAVEL THE ENGINE WAS SHUTDOWN AS A PRECAUTION. MAINTENANCE REPLACED HMU P/N 2-193-330-10, SN/OFF 98AGU722, SN/ON 4AGU275 IAW JOB CARD 7310-502. ALL CHECKS GOOD. RAN ENGINE, ALL OPS CHECK GOOD.