As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT RETURNED TO FIELD WITH FWD LAVATORY OVERFLOWING IN THE CABIN. UPDATE FOUND FORWARD LAVATORY COLD WATER FAUCET STUCK IN THE FULL-ON POSITION CAUSING THE SINK TO OVERFLOW INTO THE CABIN. MAINTENACE SERVICED THE POTABLE WATER TANK AND LEAK CHECKED THE SYSTEM, NO LEAKS FOUND.