As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAV SMOKE DETECTOR (FWD) ALARMED WHILE PASSENGER WAS INSIDE DURING BOARDING. REMOVED FROM SERVICE. PERFORMED OPS TEST OF LAV SMOKE DETECTOR SYSTEM PER E175 AMM 26-14-01-700-801-A.OPS CHECKS GOOD .NO OTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.