As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE PAX BOARDING AND BAGGAGE LOADING, RECEIVED A SMOKE CARGO WARNING WITH ASSOCIATED WARNINGS. CARGO COMPARTMENT WAS CHECKED, AND NO FIRE OR SMOKE NOTED. REPLACED FORWARD CARGO SMOKE DETECTOR. OPERATIONAL CHECK GOOD. REF CRJ MM CHAP 26-15-00.