As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT GEN DRIVE EICAS MESSAGE RAN QRH - APU FAULT DIVERTED TO KIAD. NOTED DURING ENGINE RUN IDG DRIVE LIGHT STAYED ILLUMINATED AND LEFT GEN FAULT IMMEDIATELY AFTER ENGINE START. NOTED GENERATOR DRIVE RESET RING WOULD NOT RESET. REPLACED LEFT ENG IDG IAW ABOVE REF. ALL INDS CHECKED NORMAL. COMPLIED WITH STEP 6 MTSI 24-10/8839 REQUESTED FULL POWER ENGINE RUN. JRH PEFORMED ENGINE TAKEOFF POWER RUN IAW JRH AND ALL PARAMETERS NORMAL.