As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATELY AFTER SETTING POWER FOR TAKE OFF, THE NR 1 DC GENERATOR CAUTION BEGAN FLASHING. REJECTED THE TAKE OFF AT 40KTS, NO OTHER CAUTIONS ILLUMINATED. REMOVED FROM SERVICE. REPLACED THE NR 1 DC STARTER GEN IAW AMM 24-31-01-000/400-801. OPS CHECKED GOOD. RETURNED TO SERVICE.