As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHEN AFT LAV IS FLUSHED NOXIOUS FUMES AND SMELLS ARE PUSHED INTO THE CABIN SMELL AND FUMES SLOWLY DISSIPATE SEVERAL MINUTES AFTER FLUSHING THE AFT LAV-C/A-PERFORMED TROUBLESHOOT ON AFT 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.