As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLT/HKY - FLT 5037 - AFTER TAKEOFF, FLIGHT CREW NOTICED BAGGAGE COMPARTMENT SMOKE DETECTOR LIGHT ILLUMINATED. IN-FLIGHT EMERGENCY DECLARED. ACFT RETURNED TO CLT WITH NO PROBLEMS. MAINTENANCE DISPATCHED TO ACFT AND FOUND A BAD SMOKE DETECTOR. REMOVED AND REPLACED SMOKE DETECTOR. SYSTEM OPS CHECKED GOOD. ACFT RETURNED TO SERVICE. (X)