As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POST FLIGHT CHECKS, BLUE WATER WAS NOTED DRIPPING FROM ACFT BELLY PANEL. INVESTIGATION FOUND THE LAVATORY WASTE DRAIN DUCT CRACKED INBD OF THE LAVATORY SERVICE PANEL. THE LAVATORY DRAIN DUCT WAS REMOVED & IT WAS NOTED THAT THERE WERE SEVERAL ATTEMPTS TO REPAIR CRACKS IN THE WALL OF DUCT. THE DUCT WAS REPLACED WITH NEW.