As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR---CO3359, CREW REPORTED, "EICAS MESSAGES E1/E2 EXTBTL A INOP"; OCCURRED SHORTLY AFTER LANDING. MAINTENANCE REMOVED AND REPLACED "A" FIRE EXTINGUISHER BOTTLE. AIRCRAFT TESTS GOOD IAW EMB145 MM 26-21-02. AIRCRAFT RETURNED TO SERVICE.