As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 524 - MCI TO RDU - WHILE FLIGHT CREW WAS PERFORMING PRE-FLIGHT WALK AROUND AND SYS CHECKS, ENCOUNTER THAT THE BAGGAGE SMOKE DETECTOR TEST FAIL. MX PERSONNEL REMOVED AND REPLACED RELAY K0630 AND OPERATIONALLY CHECKED SATISFACTORY AND AIRCRAFT WAS RELEASE TO RETURN FOR SERVICE IN AIRWORTHY CONDITIONS.