As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE, ENROUTE, CREW REPORTED THE LT ENGINE OIL QTY DROPPED TO ZERO. OIL PRESSURE AND TEMPERATURE WAS NORMAL. FLIGHT DIVERTED AND LANDED WITHOUT INCIDENT. MX FOUND THE NR 1 ENGINE IDG GARLOCK SEAL LEAKING. REMOVED IDG AND REPLACED GARLOCK SEAL. REINSTALLED NR 1 IDG. LEAK AND OPS CHECKED OK.