As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE RT GENERATOR AND RT AC BUS WERE LOST AND SMOKE ENTERED THE COCKPIT AND CABIN WHILE EN ROUTE FROM EWR TO GRU. THE APU WAS STARTED, BUT IT WOULD NOT RECOVER THE RT AC BUS. THE AIRCRAFT WAS DIVERTED TO BSB WHERE IT LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE RT GCU BURNED OUT. THE RT GCU WAS REMOVED AND REPLACED AND OPERATIONAL CHECKS WERE GOOD.