As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT GEN DRIVE LIGHT CAME ON AFTER TAKEOFF AND IDG WAS SUBSEQUENTLY DISCONNECTED ACCORDING TO THE QRH. BPCU FAULTED LEFT GEN OVER FREQ CODE 24-355-01 AND 24-314-11 OVER FREQ. REPLACED LEFT GCU. RAN ENGINE, LEFT ENG GEN SYS CHECK NORMAL.