What was found
NOXIOUS FUMES EMANATING FROM FWD LAV. SERVICING AND CLEANING ONLY MASK THE FUMES / SMELL AND THEY RETURN PROMPTLY AFTER SERVICING AND CLEAN8ING OF THE FWD LAV. FUMES ARE NOTICABLE IN THE CABIN BACK TO ROW 3-C/A-DEFERRED FWD LAV M PROCEDURES C/W MEL 38-11 AUTH 090247DM-N MOC 607038. PERFORMED TROUBLESHOOT ON FWD LAV FLUSH SYSTEM IAW FIM 25-40-00. NO DEFECT FOUND. PERFORMED FLUSH VACUUM WASTE SYSTEM DUCTING IAW WORK CARD 38-32-00-002. OPC GOOD. NO FURTHER DEFECT NOTED. MEL RESTORED.