As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
OIL RESIDUE ON #1 ENGINE COWLING AND SMALL OIL PUDDLE ON GROUND BENEATH #1 ENGINE. GROUNDED - YES. PERFORMED B737-900 AMM TASK 71-71-00-200-801-F00. FOUND ENG 1 IDG PAD DRAIN LEAKING 6 DROPS /MIN AFTER ENGINE SHUTDOWN. REMOVED AND REPLACED #1 ENGINE IDG REF AMM 24-11-11.