As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 6479 - ORF-IAD - DURING TAXI, AIRCRAFT RETURNED TO GATE DUE TO MAIN BAGGAGE BAY SMOKE DETECTOR WOULD NOT TEST. AIRCRAFT WAS FERRIED TO IAD WHERE MAINTENANCE INSPECTED AND REMOVED AND REPLACED AFT SMOKE DETECTOR. OPS CHECK OK. AIRCRAFT WAS RELEASED AND APPROVED FOR RETURN TO SERVICE. (M)