As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO4148, DURING CRUISE FLIGHT SEGMENT CREW REPORTED FIRE EXT BTL E1-E2 BTL A INOPERATIVE DURING MOST OF CRUISE FLIGHT. MAINTENANCE TROUBLESHOT SYSTEM AND FOUND A FAULTY FIRE BOTTLE A-POSITION. MAINTENANCE REMOVED AND REPLACED THE FIRE BOTTLE IN A-POSITION AND OPS CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.