As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
Aircraft 966 at the gate in CLT during preflight check. The right engine fire warning light illuminated and could not be extinguished. No emergency was declared and no emergency procedures were used. Maintenance removed and replaced the right engine zone one fire detection loop. System ops check was good. Aircraft retrurned to service.