1669 - BCU FAULT DURING TRAIN PREP ~~~~~ 1669 - BCU FAULT DURING TRAIN PREP.  1669 found FC 308 on TIMS. Replaced BCU & security check - OK. Brake function test & brakes able to release with no fault indication. Wheel diameter setting @ 803mm. Resealed STBS at both cabs. Shunting movement - OK.  Fazly/Farid/Rajamohan 44794 #1669 BCU S/N : OLD : 15-41-273 NEW : 1449-097