As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE POTABLE WATER WAS LEAKING FROM THE SUPPLY LINE IN THE 4F-RC LAVATORY INTO THE CABIN. AN EMERGENCY WAS DECLARED AND LANDED WITHOUT INCIDENT. THE AIRCRAFT WAS GROUNDED. FOUND THE COUPLING SEAL WAS CUT. REPLACED THE SEAL IAW AMM 38-10-01-910-803.