As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
B18208 #4 ENG OIL LOST IN FLIGHT CAUSE IFSD AND DIVERT TO ANC.C/A:1.GND CHK FOUND #4 BEARING OIL PRESSURE TUBE LOOSEN FROM INSIDE OF THE TURBINE EXHAUST CASE 7 OCLOCK POSITION. 2.TPE SENT AOG TEAM AND SPARE ENGINE TO ANC FOR #4 ENG CHANGE. 3.ENGINE CHANGE HAD BEEN FINISHED ON 5/19 01:00 TPE TIME. 4.WAIT ENGINE SHIP BACK TO TPE.