1546-BRAKE FAULT DURING TRAIN PREP. TO C ~~~~~ To change out 1546 BCU.  1546 BCU replaced. Security/function test - OK. #1546 BCU S/N : OLD : 1834237 NEW : 1833222  Nelson/Tarmidzi 44300 1546 - BRAKE FAULT DURING TRAIN PREP.  1546 ACU (S/N 1032047) swapped to #2546 (S/N 1037048). OPS 20 raised to C/o #1546 BCU.  Alan/Lee PT 44300