As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ATB-ETOPS SIGNIFICANT SYSTEM - RT GEN DRIVE EICAS MSG DISPLAYED GEN DRIVE LT ILLUMINATED STEADY GEN DRIVE WAS DISCONNECTED. A/C RETURNED TO LAX, WHERE AN UNEVENTFUL LANDING WAS MADE. REMOVED NR 2 IDG IAW HAL 767-3-405001. REPLACED IDG AND GCU, LEAK CHECK AND OPERATIONAL CHECK NORMAL IAW CARD NOL 767-3-405001.