TC reported "BCU emergency BCP bogie 2faultat Rear M2 car, TIMS displayed. TC performed brake status check - no abnormalities. ~~~~~ 2676 ER D/L & found FC 329 (BCU fault). Found fault self cleared during depot shunting. Swapped BCU from #2676 to #2675 & #2676 ACU transmitter to #1676 & #2676 BCP2 transmitterto #1675. Found #2676 having abnormal EM brake pressure. Fault not transferred after swapping.  Kana/Anand. 20/03/2021.  2676 having abnormal EM brake pressure. Swapped ACUfrom #2676 to #1676 & fault transferred. Replaced ACU on #1676. Function check brake pressure on all cars within criteria. #1676 ACU S/N : OLD : 1511/083. NEW : 1447/051. Sarma/Rasul. 21/03/2021.