As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE CREW REPORTED THAT DURING FLIGHT THEY HAD A NR 1 PACK OVERLOAD EICAS MESSAGE. THE QRH WAS USED AND BOTH PACKS WERE SELECTED OFF. FOLLOWED SEVERAL MINUTES LATER BY AN ELECTRICAL BURNING ODOR AS WELL AS SMOKE IN THE COCKPIT, THE F/A ALSO REPORTED SMOKE ALONG THE CEILING IN THE CABIN. THE CREW DECLARED AN EMERGENCY AND PERFORMED AN EMERGENCY LANDING WITHOUT INCIDENT.