As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 5215, CREW REPORTED CLIMBING THROUGH 1000 FEET, RECEIVED A LAVATORY SMOKE WARNING. NO FIRE OR SMOKE NOTICED. FOLLOWED AOM PROCEDURES AND DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. OPEN