As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED RECIEVING AN AFT CARGO DOOR LIGHT DURING TAKE OFF ROLL AND ABORTED THE TAKEOFF AT 75 KNOTS. THE AIRCRAFT RETURNED TO THE GATE WITHOUT FURTHER INCIDENT. MAINTENANCE INSPECTED THE AFT CARGO DOOR PROXIMITY SWITCH SENSOR, TARGET AND CONNECTOR WITH NO DEFECTS NOTED. MAINTENACE CLEANED THE AFT CARGO DOOR PROXIMITY SWITCH TARGET AS A PRECAUTIONARY MEASURE.