TIMS showed Front M2 and Rear M2 BCU unit not healthy. TC feedback train performance - ok. ~~~~~ 2707 FC 355X3 , 2708 FC354X2 2707 Axle 4 speed sensor and 2708 Axle 3 speed sensor replace and conduct limited and depot shunting-ok. No fault occurrence. Self test-ok. 2707 Axle 4: Old s/n: 20071729535002 New s/n: 2330287F02 Notification to CSC: 2523098 2708 Axle 3: Old s/n: 2007172954002 New s/n: 20192330289 Notification to CSC: 2523100 Done by: Saini and Asruddin