As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ONT - ON TAXI OUT FOR FLIGHT 2514 RETURNED TO THE GATE WITH A PASSENGER DOOR HANDLE OUT MESSAGE. PLACED ON MEL IAW MEL REF 52-70-1. 12/27 REMOVED AND REPLACED PROX SENSOR PX107 IAW 52-70-04-000-808-A01 AND 52-70-04-400-808-A01. OPERATIONAL CHECKED GOOD, SENSOR UNREASON/OPEN FAULT CLEARED. AIRCRAFT RETURNED TO SERVICE.