As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROACHING TOP OF DESCENT, RECEIVED A NR 1 ENGINE OIL QUANTITY LOW WARNING. ACCOMPLISHED QRH AND CONTINUED TO NORMAL LANDING. MAINTENANCE REPORTED OIL TANK EMPTY UPON SERVICING CHECK AND A SIGNIFICANT AMOUNT COMING FROM THE AFT SUMP SCAVENGE LINE. ENGINE CHANGE SCHEDULED. REMOVED AND REPLACED LEFT ENGINE IAW MCM 71-94-01. LEAK AND OPS CHECKED GOOD. AIRCRAFT WAS GROUNDED.