As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: REPEATED WRITE-UP. VERY STRONG URINE SMELL PERSISTS FROM ROW 25 ALL THE WAY TO THE BACK OF THE AIRCRAFT. REPLACED BOTH O-RINGS (AALA202604274213), (AALA202604274937) AND SLEEVE (AALA202604274467) AT TOILET DRAIN COUPLING DUE TOLEAK. PER AMM 38-21-01. NO FURTHER LEAKS NOTED.