As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING THE TAKEOFF IN OMA, THE OIL QUANTITY DROPPED TO ZERO AND STAYED AT ZERO QUANTITY ON THE RETURN TO OMA. SHUTDOWN THE NR 2 ENGINE AS A PRECAUTION, DUE TO MX PUTTING IN 6 QTS OF OIL IN THE ENGINE THE DAY BEFORE. ENGINE WINDMILLED 5 MINUTES AND SOME OIL PRESSURE WAS INDICATED. COMPLETED TASK CARDS 7261-501 AND 8010-501. REPLACED NR 2 ENGINE STARTER CARBON SEAL AND RUNNER AND STARTED SHAFT SEAL. OP AND LEAK CHECKS OK.