What was found
ON FLIGHT 4343, CREW REPORTED SMOKE AFTER TAKEOFF ODOR AND SLIGHT HAZE IN AFT CABIN FOR APPROX TWO SECOND. CREW DECLARED A EMERGENCY AND RETURNED TO BLOCK. AIRCRAFT REMOVED FROM SERVICE. PERFORMED ETN EM-72-034, NO DEFECTS NOTED. EXAMINED DUCTS, NO DEFECTS. OPERATION CHECK GOOD OF PACK SYSTEM GOOD, NO SMELL NO SMOKE. NO PARTS CHANGED. AIRCRAFT RETURNED TO SERVICE.