As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MFI INSPECTION OF NR 1 ENGINE IDG OIL LEVEL SHOWS NO OIL VISIBLE AND OIL WITHIN C- DUCT AREA. ACFT GROUNDED. PERFORMED LEAK CHECK ON THE NR 1 ENG IDG OIL COOLER, FOUND A PUDDLE LEAK FROM COOLER INBD SIDE, INSIDE FAN FRAME AREA. SERVICED THE NR 1 IDG TO FULL PRIOR TO RUN IAW AMM 12-13-21. REMOVED AND REPLACED THE NR 1 ENG IDG AIR/OIL COOLER IAW AMM 24-11-21-000, AND 24-11-21-400. LEAK CHECKED GOOD. SERVICED IDG.