As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUR OUT OF EIGHT LAVS INOP THE 4 GOOD LAVS FLUSH CLEAR FLUID. *S/D* AFTER 10 DAYS & CONSIDERABLE TROUBLESHOOTING & TANK SERVICING, DETERMINED LEFT AFT TOILET HAD VALVE PROBLEM WITH CONTINUOUS FLUSHING PROBLEM. REPLACED TOILET ASSEMBLY. LAV SYSTEM CHECKED OK FOR SERVICE.