As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING PDC FOUND #2 IDG NO OIL AND EVIDENCE OF OIL LEAK FROM IDG OIL COOLER. GROUNDED - YES. FOUND IDG AIR/OIL COOLER LEAKING ON #2 ENGINE. REMOVED AND REPLACED IDG AIR/OIL COOLER REF B737-900 AMM 24-11-21, NO LEAKS NOTED OPS CHECKS GOOD . PERFORMED IDG AIR/OIL COOLER INSPECTION CHECK REF AMM 24-11-21.