As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ELECTRICAL GENERATOR SYS RT IDG HAS DISCONNECTED OR A PROTECTIVE TRIP OF THE GENERATOR CONTROL BREAKER HAS OCCURRED OR A PROTECTIVE TRIP OF THE BTB HAS OCCURRED. ELECT GEN OFF RT EICAS MSG AT ENGINE START. RIGHT IDG INOPERATIVE. TRIED SWAPPING GCU 1 AND 2 PER MM, NO HELP STILL HITTING GENERATOR RETURNED GCU 1 AND 2 TO ORIGINAL POSITIONS. REMOVED NR 2 ENG IDG. REPLACED RT IDG PER MM, OPS CHECK NORMAL.