As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAVATORY SMOKE DETECTOR SOUNDED IN CRUISE. SOURCE UNKNOWN. NO VISIBLE SMOKE. DIVERTED. LANDING UNEVENTFUL. REMOVED FROM SERVICE. C/W E175 AMM TASK 26-14-01-700-801-A. OPS CHECK GOOD. NO FURTHER DEFECTS NOTED. COULD NOT DUPLICATE. NO PARTS REPLACED.