As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE MASTER WARNING ILLUMINATED DURING PRE FLIGHT. REMOVED FROM SERVICE. NO ACTIVE SMOKE MASTER CURRENTLY ON EICAS. CW TEST OF FWD LAV SMOKE SYSTEM IAW E175 AMM TASK 26-14-01-700-801-A. SYSTEM TEST GOOD. NO FURTHER DEFECTS NOTED. SMOKE MASTER CAUTION REMAINS EXTINGUISHED. RETURNED TO SERVICE.