As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SMOKE IN THE AIRCRAFT, ELECTRICAL ODOR THROUGHOUT AIRCRAFT AND IN THE COCKPIT. DECLARED AN EMERGENCY AND RETURNED TO DEPARTURE. MAINTENANCE PERFORMED TSM 05-50-00-810-831-A. GVI OF THE NR 1 PACK, FOUND INDICATIONS OF OVERHEATING. DEACTIVATED THE PACK IAW AMM 21-51-00-040-002-A. NO OTHER DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE.