As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE M/W RAN QRH MESSAGE CLEARED NO SIGNS OF SMOKE OR FIRE. REMOVED FROM SERVICE. PERFORMED GVI OF BOTH LAVS NO SIGN OF LAV WASTE EXTINGUISHER GONE OFF. PERFORMED OPS TEST IAW E175 AMM 26-14-01-700-801-A OPS TEST GOOD NO FURTHER DEFECTS NOTED. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.