As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD FLT 6147 - THE CREW REPORTED A LAV SMOKE EICAS WARNING MESSAGE ALSO REPORTED SMOKE IN CABIN FROM ROW 5-7 CEILING AND WALL. THE AIRCRAFT RETURNED TO ORD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND RESECURED THE NR 2 PACK DUCT. RAN BOTH ENGINES AND NO DEFECTS WERE NOTED. THE AIRCRAFT WAS RETURNED TO SERVICE.