As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, THE MAIN LANDING GEAR DOOR OPEN INDICATION ILLUMINATED. THE FLIGHT CREW ABORTED THE TAKEOFF AND RETURNED TO BOARDING GATE WITHOUT INCIDENT. MAINTENANCE REPLACED THE RIGHT MAIN LANDING GEAR DOOR SENSOR AND PERFORMED A TEST OF PROXIMITY SENSOR ELECTRONICS UNIT IN ACCORDANCE WITH MAINTENANCE MANUAL PROCEDURES. OPERATIONAL TEST NORMAL.