As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAXI, CREW REPORTED SMOKE TOILET MESSAGE AND NOTED RT PACK AT 120 DEGREES C AND UNCONTROLLABLE. CREW SHUTOFF RT PACK AND SMOKE TOILET MESSAGE CLEARED. CREW RETURNED TO GATE. MX INSPECTED, R & R RT ACM AND PERFORMED CHECKS IAW AMM. ACFT RELEASED FOR SERVICE.