As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3900 - CREW REPORTED NUMBER 1 ENGINE OIL QUANTITY WENT FROM 11 TO 4 QTS IN LESS THAN 15 MINUTES. PERFORMED PRECAUTIONARY SHUTDOWN. OVERWEIGHT LANDING PERFORMED 43700 LBS TOUCHDOWN OF LESS THAN 100 FPM. AIRCRAFT LANDED UNEVENTFULLY. AIRCRAFT REMOVED FROM SERVICE. REMOVED NR 1 ANGLE GEARBOX BREATHER MAGNETIC CARBON SEAL IAW ROLLS ROYCE FIM TASK 72-00-00-810-815, REF ETN EM 79-007 R1. RESERVICED OIL WITH 14 PTS IAW AMM 79-11-01. NO DEFECTS NOTED. PASSED FCF AND COMPLETED TRIAD EVENT AIRCRAFT RETURNED TO SERVICE.