As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB - EICAS MSG GEN DRIVE DISPLAYED GEN DRIVE LIGHT ILLUMINATED GEN DRIVE DISCONNECTED ON RIGHT ENGINE. REMOVED AND REPLACED IDG IAW CARD 767-3-405001 AND MM 24-11-01 OPS CK NML. AIRCRAFT RETURNED TO LAX WHERE A UNEVENTFUL LANDING WAS MADE.