As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RTB AFTER LGEN WAS INDICATED ON EICAS. L DRIVE LIGHT REMAIN ON. FWD TO MEL PLACARD PER 24-00-01. REMOVED AND REPLACED NR 1 ENG IDG ASSY IAW MM. PERFORMED ENG RUN PER DELTA PFH, OPS CHK OK LEAK CHK OK MSGS CLEARED MCO AND PLACARD REMOVED.