What was found
CLE- FLIGHT 3040, THE CREW NOTED THAT THE LAV SMOKE INDICATION ILLUMINATED THROUGH APPROXIMATELY 18,000 ON CLIMBOUT FROM BNA. PERFORMED A VISUAL INSPECTION OF LAV AND A VISUAL INSPECTION OF THE LAV EXTINGUISHER. NOTHING ABNORMAL FOUND. WARNING CEASED AFTER TESTING FROM F/A GALLEY. PULLED CB E11 & E12 PER QRH. CLEANED DUST FROM SMOKE SCREEN, PERFORMED A OPERATIONAL CHECK OF THE LAV SMOKE DETECTION SYSTEM, NO DEFECTS NOTED. THE AIRCRAFT WAS APPROVED FOR RETURN TO SERVICE.