As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING T/O AT 75 KNOTS THE RIGHT ENGINE GENERATOR OFF AND RIGHT ENGINE GENERATOR DRIVE LIGHTS AND EICAS MSGS ILLUMINATED. DISCONTINUED THE T/O AND RETURNED TO THE GATE. REMOVED AND REPLACED RT IDG GENERATOR PER AMM. PERFORMED ENG RUN, ALL NORMAL.