As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
REF L/P 60182965 #2 ENG IDG OIL COOLER AND ADG AIR/OIL COOLER REQUIRES REMOVAL AND REPLACEMENT CONTINUE WITH #2 ENG IDG INSTALLATION TEST REF B737-900 AMM 24-11-11 STEP 3(I). GROUNDED - YES. REMOVED AND REPLACED #2 ENG IDG OIL COOLER AND IDG AIR/OIL COOLER IAW AMM 73-11-06 AND 24-11-21. PERFORMED #2 ENG IDG INSTALLATION TEST IAW AMM 24-11-11 LEAK AND OPS CK OK SEAMC RON NOTIFIED A&P TSAR174M.