As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE NUMBER 2 INTEGRATED DRIVE GENERATOR FAILED. AIRCRAFT DIVERTED TO JFK. *S/D* A HYDRAULIC LOG FAILURE OCCURRED IN THE IDG. HEAVY CYLINDER BLOCK WEAR ALSO CONTRIBUTED TO A LOSS OF OIL CHARGE PRESSURE AND AN INABILITY TO MAINTAIN FREQUENCY. THE IDG WAS REPLACED.