Duct Assy,Air Fre SVCE  700BC/I
  700BC/I Use Prior to Serial #3172039.
          From #3100000 to #3172039 See 7012912
          Prior to #3100000 See 7004081
  700BC   Use Prior to Serial #3172039.
          From #3100000 to #3172039 See 7012911
          Prior to #3100000 See 7004081