As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT GEN DRIVE LEFT CAME ON 30 MINUTES INTO FLIGHT WITH ASSOCIATED ICAS MESSAGE DISCONNECTED LEFT IDG IAW QRH PROCEDURES APU STARTED AND RAN FOR REMAINDER OF FLIGHT. REMOVED AND REPLACED LEFT IDG PER MM, OPS CHECK AND LEAK CHECK GOOD PER MM. (M)