1687 BCU fault (train prep) ~~~~~ 1687 BCU fault (train prep)   Downloaded ER and fault code in Card 5. fault unable to duplicate. Fault code 308, 330, 331. Carried out brake check ok. No air leaking found at ACU. Replaced new ACU as precaution. Thereafter carried out function test - ok. No air leak detected. Depot shunt ok. N.ALAI/TEH AM/18.04.21 ---------------------