What was found
DFW - FLT 0600 - AFTER TAKEOFF FROM DFW, SMELL OF SMOKE IN COCKPIT. FLIGHT ATTENDANT REPORTED SMELL AND HAZE IN CABIN. DECLARED EMERGENCY, RETURNED AND LANDED DFW WITHOUT FURTHER INCIDENT. REPLACED LEFT PACK RECIRCULATING FAN. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)