TIMS showed BCU intermittent fault at car 3554. Train performance - ok. ~~~~~ 3554 TIMS showed BCU intermittent fault. Train performance - ok.  553/554 ER D/L & found FC 327 at #3554 & FC 330/331/312 at #2554. Replaced tacho 4 at #3554 & ACU at #2554. Brake pressure test - OK. #3554 Tacho 4 S/N : OLD : 12-49-233 NEW : 00-22-080 #2554 ACU S/N : OLD : 1038/060 NEW : 1047/084  Chan GF/Alcus 44117