As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED ENG 2 FIREX BTL A FAIL AND ENG 1 FIREX BTL A FAIL MSG ON AND OFF THROUGHOUT FLIGHT TO MKE. MAINTENANCE WAS DISPATCHED TO AIRCRAFT TO TROUBLESHOOT. MTX REMOVED AND REPLACED FIRE EXTINGUISHING BOTTLE A, AND PERFORMED OPS CHECKS EMB AMM. A/C WAS THEN RELEASED BACK INTO SERVICE.