As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOLLOW-UP TO #1 IDG FREQUENT SERVICING. (#PRI2/ETOPS). GROUNDED - YES. RAN # 1 ENGINE FOR 10 MINUTES, NO LEAKS NOTED ON IDG AND NO LEAKS NOTED FROM DRAIN, REPLACED VENT VALVE AND SERVICE FITTING. CHANGED IDG OIL COOLER, PART EFFECTIVITY VERIFIED REF B737-800 AMM 73-11-06. PERFORMED GROUND VERIFICATION TEST, CHECKED NORMAL.