As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AS THE AIRCRAFT WAS TAXIING ONTO THE RUNWAY, THE FLIGHT RECEIVED A PROXI DOOR FAIL WARNING MESSAGE FOR THE MAIN CABIN DOOR. THE FLIGHT CREW EXITED THE RUNWAY AND RETURNED TO THE GATE. THE FLIGHT CREW CYCLED THE MAIN CABIN DOOR PROXI SENSOR CIRCUIT BREAKERS AND THE MESSAGE CLEARED. THE AIRCRAFT WAS REBOARDED AND DEPARTED WITHOUT ANY FURTHER PROBLEMS.