As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DEN - FLIGHT 4325, ON TAXI OUT, THE RIGHT OUTBOARD (NR 4) BRAKE TEMP WENT FROM 4 IN THE GREEN TO 8 IN THE WHITE. RETURNED TO THE GATE. BRAKE WAS NOT DRAGGING. MAINTENANCE INSPECTED THE AIRCRAFT AND PLACED THE INDICATION ON MEL 32-46-1. THE MEL WAS CLEARED BY REPLACING THE NR 4 BRAKE AND THE THERMOCOUPLE SENSOR FOR THE TEMP INDICATION. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.