As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5121 FROM HKY TO CLT, SMOKE DETECTOR CAUTION LIGHT ILLUMINATED IN LAVATORY DURING SHORT FINAL INTO CLT. NO EMERGENCY WAS DECLARED. AIRCRAFT LANDED IN CLT WITH NO OTHER PROBLEMS. MAINTENANCE REMOVED AND REPLACED THE LAVATORY SMOKE DETECTOR, SYSTEM OPS CHECKED GOOD. AIRCRAFT WAS RETURNED TO SERVICE.