As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EICAS MSG L GEN DRIVE DISPLAYED. GEN DRIVE LIGHT ILLUM. GEN DRIVE DISCONNECTED. CREW COMMENTS: L T ENG DRIVE LIGHT CAME ON AFTER T/O AND WENT OUT AFTER TWO MINUTES WITH NO CREW ACTION. FUEL OIL COOLER LEAKING AND IDG DRY. REPLACED NR 1 ENGINE IDG & NR 1 ENG FUEL OIL COOLER & BYPASS VALVE.