As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND OIL FILM ON #2 ENG INBOARD INNER TR HALF POSSIBLY COMING FROM IDG OIL COOLER. GROUNDED - YES. REMOVED AND REPLACED IDG OIL COOLER PER B737-800 AMM 24-11-21. PERFORMED IDLE POWER LEAK CHECK REF AMM TASK 71-00-00-700-801-F00, NO LEAKS NOTED, ETOPS GROUND VERIFICATION SUCCESSFUL.