As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING WALK AROUND FOUND SUSPECTED OIL LEAK ON #2 ENGINE IBD AFT INNER COWL. GROUNDED - YES. C/W B737-800 AMM 79-00-00 AND 71-71-00 ENG VENT AND DRAINS INSPECTION FOUND #2 ENG IDG AIR/OIL COOLER LEAKING WITH LARGE OIL STAIN AFT OF COOLER. REMOVED AND REPLACED ENGINE #2 IDG AIR/OIL COOLER. OPS CHECK GOOD. LEAK CHECK GOOD. REF AMM 24-11-21.