What was found
FLT 7976 - IAD - LAVATORY SMOKE MESSAGE ON EICAS IN FLIGHT. MAINTENANCE CLEANED THE SMOKE DETECTOR FILTER.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
FLT 7976 - IAD - LAVATORY SMOKE MESSAGE ON EICAS IN FLIGHT. MAINTENANCE CLEANED THE SMOKE DETECTOR FILTER.