As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN FLIGHT FROM IDA TO SEA WE HAD A MASTER WARNING SMOKE LAV MESSAGE THAT LASTED BETWEEN 20 AND 30 SECONDS. NO INDICATION OF SMOKE IN EITHER LAV. A PASSENGER WAS IN THE AFT LAV WITH NO INDICATION OF VAPING OR SMOKING. REMOVED FROM SERVICE. REF E175 FIM 26-14-00-810-803-A, AND E175 AMM 26-14-01-700-801-A. OPS TEST GOOD. NO DEFECT NOTED. NO ACTIVE EICAS MESSAGE. NO PARTS REPLACED. RETURNED TO SERVICE.