What was found
F/A REPORTED THAT THE LAV SMOKE ALARM SOUNDED AFTER T/O FOR APPROX 15 SEC. NO SMOKE DETECTED AND FIRE EXTINGUISHER IN WASTE BIN DID NOT DISCHARGE. NO FIRE NOTED. DE-BRIEFED FLIGHT CREW, THEY NOTED THAT A "MOTH EXITED THE LAV WHEN DOOR WAS OPENED TO INSPECT LAV FOR SMOKE". INSPECTED LAV SMOKE DETECTOR ASSY FOR VISUAL DEFFECTS AND SECURITY, NO DEFECTS NOTED, DETECTOR SECURE. C/W OPS TEST OF LAV SMOKE DETECTOR IAW AMM TASK 26-12-11-710-801 OPS CHECKS GOOD, NO DEFECTS NOTED. LAV SMOKE DETECTOR OK FOR CONTINUED SERVICE. NOTE: INSPECTED WASTE BIN FIRE EXTINGUISHER, IT DID NOT DISCHARGE. RETURNED TO SERVICE. NO PARTS WERE REPLACED.