As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ASH 7041 ORD. THE CREW REPORTED A CARGO SMOKE WARNING DURING TAXI AND THE BOTTLES WERE DISCHARGED. THE AIRCRAFT RETURNED TO THE GATE WHERE ON CALL MAINTENANCE INSPECTED THE AREA FOR ANY EVIDENCE OF FIRE OR SMOKE AND NONE WAS FOUND. THE DETECTORS WERE PLACED ON DEFERRAL AND THE AIRCRAFT CONTINUED SERVICE. 3/1 MX REPLACED BOTH FIREX BOTTLES, P/N 473919-1, S/N 50777EL AND P/N 473920-1, S/N 51122EL.