As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF ROLL, MASTER CAUTION ILLUMINATED AND SEVERAL LIGHTS STARTED BLINKING. TAKEOFF WAS ABORTED AND RETURNED TO THE GATE. INSPECTED CROSSTIE RELAY, LEFT AND RIGHT GENERATOR RELAYS AND NO DEFECTS FOUND. REPLACED THE LEFT GENERATOR CONTROL PANEL AND VOLTAGE REGULATOR. REPLACED BUS CONTROL PANEL AND OPERATIONAL CHECK GOOD.