As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FLIGHT, NR 2 ENGINE HAD AN NON-COMMANDED PARTIAL POWER LOSS. A LOUD BANG WAS HEARD, THE NR 2 ENGINE NG DROPPED FROM 91 TO 72 PERCENT, T4 DROPPED FROM 568 TO 441. AFTER 90 SECONDS, ENGINE SPOOLED BACK UP TO 80 PERCENT NG. ACFT LANDED WITHOUT FURTHER INCIDENT.