As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF, STRONG SMELL OF SMOKE WAS NOTICED IN CABIN. FLIGHT CREW DECLARED A YELLOW EMERGENCY AND RETURNED TO DEPARTING STATION. FLIGHT LANDED OVERWEIGHT BUT EVERYTHING ELSE WAS NORMAL. MAINTENANCE INSPECTED DUCTS, GALLEYS, AND LIGHTS; NO FAULT FOUND. MAINTENANCE FOUND THE NR 1 PACK OVERHEATING. REPLACED THE ACM WHICH TESTED AND CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.