As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT EICAS MSG "R GEN DRIVE" DISPLAYED WITH DRIVE LIGHT ON DISCONECT SWITCH. DISCONNECTED PER THE QRH PROCEDURE. THE APU WAS DEFERRED AND THE APU GENERATOR COULD NOT BE USED. THE CREW DECIDED TO DIVERT TO KMEM INSTEAD OF CONTIMUING TO KDEN. THE AIRCRAFT LANDED AND WAS GROUNDED BY MAINTENACE. MAINTENANCE REMOVED AND REPLACED THE RIGHT IDG IAW AMM 24-11-01. AIRCRAFT WAS RETURNED TO SERVICE