TIMS show BCU fault at car 3688. Train performance - ok. TIMS show BCU fault at car 3688. Train perf ormance - ok. ~~~~~ TIMS show BCU fault at car 3688. Train performance - ok.  Checked car 3688 FC 325 BCU speed probe 2 fault, confirmed #3688 Tacho Gen 2 faulty (120kohms). Replaced Tacho Gen, limited movement ok. old S/N: 1510506 New S/N: 88066 Notification to CSC: 2521071 Done by: Sufian / Morgan / Rizman 45175