TC reported TIMS showed intermittent BCUfault at front M2 car. Fault self- cleared. TC feedback tra in performance - ok. ~~~~~ 2539 TC reported TIMS showed intermittent BCU fault. Fault self- cleared. TC feedback train performance - ok. CE found 2539 intermittent BCU Fault. No Fault Code.  2539 ACU faulty - Replaced. Tested operation - OK. Old: 1244/107 New: 1037/048 Hanafi 44669