As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH FL180 ELEC AC BUS LT EICAS MESSAGE DISPLAYED. CHECKLIST PERFORMED AND APU WAS STARTED. APU POWERED LEFT MAIN A/C BUS ELEC GEN OFF LT EICAS MESSAGE REMAINED ON WITH FAILED LEFT IDG. REMOVED AND REPLACED IDG AT LEFT ENG IAW AMM 24-11-01. RUNUP ENGINE CHECKED OPS OK. SERVICED IDG. FOUND NO LEAKS. (M)