As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DFW - FLT 3642 - WHILE SHUTTING DOWN THE NR 1 ENGINE, THE FIRE INDICATION ALERTED. THE HANDLE WAS PULLED AND AFTER THE FIRE INDICATION REMAINED ON THE BOTTLE WAS DISCHARGED. THE FIRE INDICATION WENT OUT. MAINTENANCE INSPECTED THE ENGINE AND FOUND NO DEFECT. THE FIRE BOTTLE ASSEMBLY WAS REPLACED AND THE AIRCRAFT RETURNED TO SERVICE. (X)