What was found
FLIGHT 2117. (FWD) LAV SMOKE EICAS MESSAGE, RAN CHECKLIST, MESSAGE EXTINGUISHED. (NO SMOKE OR FUMES). REMOVED FROM SERVICE. TESTED FWD LAV SMOKE DETECTOR SYSTEM IAW E175 AMM TASK 26-14-01-700-801-A. OPS TEST GOOD, NO DEFECTS NOTED. RETURNED TO SERVICE. NO PARTS REPLACED.