As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE IN CRUISE, THE NR 1 ENGINE OIL QUANTITY WENT TO ZERO WITH THE OIL PRESSURE DROPPING RAPIDLY DOWN TO 8 TO 9 PSI. THE ENGINE WAS SHUT DOWN PER COM PROCEDURE AND THE AIRCRAFT RETURNED TO ANC WITHOUT DIFFICULTY. MAINTENANCE INSPECTED THE ENGINE AND REPLACED THE REAR MAIN BEARING BREATHER TUBE DUE TO A CRACK. THE FOLLOW-UP LEAK CHECK AND ENGINE WINDMILL CHECK WERE NORMAL.