1667 BCU Fault. ~~~~~ 1667 BCU Fault.  1667 ACU replaced as instructed by EMM Jefferson - Done. Function test - OK. (Refer to attachment for brake pressure readings). 1667 ACU S/N :     OLD                  NEW                  1511-090             1523-123 RF :             1734/559             1739/742 RC :             1734/550             1902/680 AF :             1742/749             1921/303 EM :             1740/967             1850/501 AC :             1742/784             2006/263  Aminur/Khairul 43915