What was found
DURING CLIMBOUT, FLIGHT ATTENDANTS REPORTED SMOKE IN CABIN ALONG WITH AFT LAVATORY SMOKE DETECTOR ACTIVATED. CREW DECLARED A RED EMERGENCY AND FLIGHT WAS RETURNED TO BUF. AIRCRAFT LANDED WITHOUT INCIDENT. FIRE EXTINGUISHERS IN AFT LAVATORY WERE UTILIZED TO DAMPEN SMOKE. MAINTENANCE INSPECTED AFT LAVATORIES FOR EVIDENCE OF SMOKE, OVERHEATING, AND/OR ELECTRICAL DAMAGE. NO PROBLEMS WERE FOUND.