What was found
THE CREW REPORTED A PACK 1 OVERLOAD ON EICAS, THE QRH WAS UNSUCCESSFUL AND THE MESSAGE REMAINED. APPROXIMATELY 20 MINUTES LATER THE F/A REPORTED SMOKE IN THE CABIN WITH THE NR 1 PACKOFF. THE CREW RAN THE CABIN SMOKE CHECKLIST AND TURNED OFF THE NR 2 PACK AND ALL SMOKE SOON DISSIPATED. MAINTENANCE INSPECTED THE ACFT AND R & R THE PACK 1 OVERTEMP SWITCH, AND THE NR 2 ACM, OPS CHECK WERE PERFORMED WITH NO DEFECTS NOTED AND THE ACFT WAS APPROVED FOR RETURN TO SERVICE.