What was found
LAVATORY DETECTOR HORN FOR SMOKE ACTIVATED CLIMBING THROUGH 12,000. FLIGHT ATTENDANT INVESTIGATED LAV FOR SMOKE & FIRE, DID NOT FIND ANY EVIDENCE OF FIRE OR SMOKE. CLIMBING THROUGH 20,000 FT ECAC LAV SMOKE WARNING. FOLLOWED QRH FOR LAV SMOKE & LAV DETECTOR RESET & TESTED. MONITORED LAV REMAINDER OF FLIGHT, LAV SMOKE WARNING EXTINGUISHED AFTER ABOUT 1 MIN. INSPECTED LAV FOR ANY OBVIOUS DEFECTS, NO EVIDENCE OF FIRE OR SMOKE NOTED. PERFORMED LAV SMOKE DETECTION SYS. OPERATIONS CHECKED WITH NO DEFECTS NOTED IAW AMM 26-14-00. PERFORMED ENG SMOKE & ODOR TROUBLESHOOTING SUPPLEMENT ETN EM-72-034 WITH NO DEFECTS NOTED. OK FOR SERVICE AT THIS TIME.