3521 reported BCU fault during train pre ~~~~~ 3521 reported BCU fault during train prep.  3521 found FC 308/330/331/312. 3521 ACU swopped to 1521 - Done. ACU S/N : 3521 : 12/36/040 1521 : 12/49/045  Nelson/Boopathy 43871 To follow up  3521 ACU Swapped With 2521. Brake Pressure Test - OK. Limited Movement - OK Old: 1249/045 New: 1044/027 Selvan/Lee PT/Arnand11/02/20