As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW FOR FLIGHT 4133, NOTIFIED MOC WHEN ON THE GATE IN MIA THAT DURING FLIGHT THEY RECEIVED AN INTERMITTENT E2 FIRE DETECT FAIL MESSAGE ON EICAS. THE AIRCRAFT WAS REMOVED FROM SERVICE. REMOVED AND REPLACED THE NUMBER 2 FIRE CONTROL MODULE. THE AIRCRAFT WAS RETURNED TO SERVICE.