As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE FLIGHT CREW REPORTED THAT THE NO2 GENERATOR FAILED TO COME ON LINE WHEN SELECTED ON. THE MAINTENANCE VENDOR TROUBLESHOT AND DETERMINED THE NO2 INTEGRATED DRIVE GENERATOR WAS FAULTY. THE IDG WAS REMOVED AND AN OVERHAULED UNIT WAS INSTALLED. OPS CHECKS WERE SATISFACTORY AND THE AIRCRAFT WAS RETURNED TO SERVICE.