What was found
SEWER SMELL IN AFT OF AIRCRAFT, FLT ATTENDANTS NAUSEOUS HAD TO BE REPLACED. DRAINED AND SERVICED ALL LAVS, INSPECTED AFT LAV DUMP TUBE FROM FLOOR LEVEL TO SERVICE PANEL, INSPECTED AREA BEHIND AFT WALL AND FWD WALL OF AFT PIT. NO DEFECTS NOTED. NO EVIDENCE OF LAV LEAKS, NO SEWER SMELL NOTED. CURRENT HISTORY: LIKE DISCREPANCY 3/21/00 AND LAV ODORS 2/20/00. RECOMENDATION: REMAIN OPEN AND MONITOR.