Heater Assy,Mullion Dom SVCE (BI-42SD,BI-48SD,
          BI-42SID)
  NOTE:   Use Prior to Serial #4341000 And Also
          From #4341020 to #4347991.
          From Serial #4341000 to #4341019 And
          Starting With Serial #4347991 See
          7040185
  NOTE:   If a Replacement Switch is Needed See
          7040876