As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FIVE HOURS INTO FLIGHT AT FL340, THE LEFT GEN DRIVE DISCONNECTED WITH THE LEFT GEN FIELD. STARTED APU TO RESTORE UTILITY/GALLEY BUSES. REPLACED LEFT IDG PER MM CPT 24, GROUND RUN OP CHECK NORMAL. NO LEAKS DISCONNECT CHECK OK. (M)