What was found
AIRCRAFT WAS GROUNDED: AN EMERGENCY WAS DECLARED AND THE AIRCRAFT DIVERTED TO ORD DUE TO THE FLIGHT CREW REPORTING THAT THE FIRST-CLASS LAVATORY SINK STARTED LEAKING 1 1/2 HOURS INTO FLIGHT. THE FLIGHT ATTENDANTS WERE UNABLE TO CONTROL LEAK WITH THE SHUT OFF VALVE WHICH FLOODED THE FIRST CLASS AREA AND BEYOND. THE AIRCRAFT LANDED SAFELY AT ORD AND TAXIED TO THE GATE UNDER ITS OWN POWER. MAINTENANCE FOUND THE FORWARD LAVATORY FAUCET AND SUPPLY LINE (AALA202412312098) LEAKING AND REPLACED THEM PER CMM 25-47-63. MAINTENANCE ALSO FOUND THE FORWARD LAVATORY SHUT OFF SELECTOR VALVE (AALA202412313972) LEAKING AND REPLACED IT PER AMM 38-11-07. A SATISFACTORY LEAK / OPERATIONAL CHECK WAS ACCOMPLISHED.