As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ETOPS SIGNIFICANT SYSTEM, APPROX 2HRS INTO FLIGHT HAD EICAS MSG "R GEN OFF" ACCOMPLISHED QRH, OPS NORMAL. PERFORMED BPCU BITE. FOUND "OPEN PHASE TRIP" ON RIGHT GEN POWER SYSTEM. PER FIM 24-20-00 TABLE 102, REPLACED RIGHT GENERATOR CONTROL UNIT PER AMM 24-22-02. REPLACED RIGHT GENERATOR CIRCUIT BREAKER PER AMM 24-22-03 (PRECAUTIONARY). OPS CHECK GOOD.