As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT GEN DRIVE EICAS AND GENERATOR DRIVE DISC ON FOR 3 MIN THEN ALL APPEAR NORMAL. AFTER REMOVAL OF NR 1 IDG FOUND CARBON DRIVE SEAL LEAKING. REPLACED IDG CARBON SEALS REF MM. RAN ENG AT IDLE. NO LEAKS NOTED. RAN ENG, DISCONNECTED LT IDG DDP CW. REPLACED IDG. RAN ENGINE AT IDLE AND NO GEN DRIVE LIGHT OR IDG EICAS MESSAGES. NO LEAKS NOTED FROM IDG.