As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 4489 EWR-JAX CREW REPORTED E1 FIRE DETECT MESSAGE ON EICAS DURING TAKEOFF. CREW PERFORMED AIR RETURN BACK TO EWR WITHOUT INCIDENT. EWR MX PERFORMED ALL ELECTRICAL CHECKS OUTLINED IN FIM 26-11-00-810-803-A WITH NO FAULTS NOTED. MX REMOVED AND REPLACED ENG 1 AND ENG 1 PYLON FIRE LOOPS IAW EMB145XR AMM 26-11-01 AND 26-11-02. INSPECTED VISIBLE HARNESSES WITH NO DEFECTS NOTED. OPERATIONAL CHECKS SUCCESSFUL. ACFT WAS APPROVED FOR RETURN TO SERVICE.