As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER START AND DURING TAXI OUT, HAD A AMBER CABIN DOOR OPEN LIGHT ILLUMINATE. RAN APPROPRIATE CHECKLIST. WITH NO JOY ON THE CHECKLIST WHILE PERFORMING STEP 4 DOOR LIFT-CANCEL BUTTON PRESS ON HOLD. WE WERE UNABLE TO GET THE OVERRIDE LIGHT TO FLASH. LEADING US TO BELIEVE THAT WE COULD NOT RESET THE DOOR.