As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED DUE TO: LAVATORYS AND GALLEYS HAD NO WATER; AIRCRAFT DIVERTED TO AND LAND LANDED SAFELY AT JFK. FOUND FILL-OVERFLOW VALVE LEAKING AIR PRESSURE. REMOVED AND REPLACED FILL OVERFLOW VALVE. PER AMM 38-11-04. ALL OPERTIONAL CHECKS GOOD.