As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 0017 - ONT TO SAT - CREW REPORTED LAV SMOKE EICAS MASTER WARNING IN FLIGHT. A/C HAD JUST BEEN DEICED MESSAGE CLEARED FO CKD LAV AND THERE WAS NO SIGN OF SMOKE. MX PERSONNEL PERFORMED OPERATIONAL CHECK AND NO FAULTS WERE NOTED AT THAT TIME. A/C WAS RELEASED IN AIRWORTHY CONDITIONS.