W/H,DC Board SVCE (BI-42SD,BI-42SID)
  BI-42SD Use From Serial #4341000 to #4435000
          Prior to Serial #4341000 See 7040030
          From #4435000 to #47543000 See 7040189
          Starting With #47543000 See 7043438
 BI-42SID Use From Serial #4341000 to #4435000
          Prior to Serial #4341000 See 7040034
          From #4435000 to #47543000 See 7040189
          Starting With #47543000 See 7043438