As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON CLIMBOUT AT FL 180, HAD LEFT GEN DRIVE EICAS MSG, FOLLOWED BY LEFT ENGINE FIRE WARNING. ENGINE WAS SHUTDOWN, FIRE BOTTLES DISCHARGED, FIRE WARNING WENT OUT. RETURNED TO DFW. FOUND NR 1 ENGINE IDG WITH UNCONTAINED FAILURE. ENGINE WAS REPLACED AND ROUTED TO SHOP.