As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C EXPERIENCED DROP IN NR 1 ENGINE OIL QTY AND PRESSURE. ENGINE WAS REMOVED FROM A/C AND HOC RUN PERFORMED AT TEST CELL. FOUND NR 1 & 2 OIL SCAVENGE TUBE LEAKING AT 'B' NUT. REPLACED TUBE. IDG CARBON SEAL AT THE MAIN GEAR BOX WAS REPLACED DUE TO THE IDG BEING REPLACED. NO HOC REPORTED AFTER TEST.