1556 - BCU Fault. To check & rectify. (T ~~~~~ To replace BCU @ 2556 due to faulty BCU. Spare BCU (S/N : 1745006) indicated BCU COMMS fault.  2556 BCU replaced & function test - OK. Brake cyclic test - OK, no recurring fault. Wheel diameter set to 850mm.  Khairul/Isam 45035 #2556 BCU S/N : OLD : 1745006 NEW : 1868024 1556 BCU Fault. (Train Prep)  1556 swapped dump v/v with #1555. Checked dump v/v connector no dust/rust. Measure BCU connector - OK. Swapped #1556 BCU to #2556. Installed new BCU on #2556 & found FC BCU com. fault at #2556. OPS 20 raised to replaced #2556 BCU.  Anand/Sarma/Kamarul/Shafie/Sugu 45034 BCU S/N : #1556 : 2007255 (swapped from #2556)       : 1810073 (swapped to #2556) #2556 : 1745006 (new BCU but faulty)