As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLE FLIGHT 3931 CREW REPORTED BAGGAGE FIRE EXTINGUISHER BUTTON ILLUMINATED DURING FLIGHT. NO EICAS MSG OR MASTER WARNING WAS ASSOCIATED. RETURNED TO CLE AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND RESET SYSTEM. ALL OPERATIONAL CHECKS WERE GOOD. AIRCRAFT WAS RELEASED FOR SERVICE.