As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON TAKEOFF ROLL GOT MASTER WARNING HORN WITH RED EICAS MESSAGE "CONFIG GEAR STEERING". ABORTED TAKEOFF AT 430000 LBS APPROX 65 KTS. NO RTO ACTIVATION. ACCOMPLISHED FIM 31-51-00 MAINTENANCE MESSAGE 31-78130. REMOVED AND REPLACED MGSCU IAW AMM 32-53-02.