TC reported when depating SOM1 and NEW1,train jerked and arching occurred. Staff(SOM) and Staff(NEW ) monitored 2 trains at platform and feedback no abnormaliti es. TC reported when depating SOM1 and NEW1, train jerked an ~~~~~ To further checks on following.  645/646 checked all M-car CCD fuses & found #1646 A1 CCD fuse blown & replaced. Checked all M-cars earth wire terminals & HV cables - OK. Limited movement & no spark found at all 4 M-car motors.  Alan/Anand 45398 3646 TC reported when depating SOM1 and NEW1, train jerked and arching occurred. Staff(SOM) and (NEW) monitored 2 trains at platform and feedback no abnormalities. CE unable to board.   645/646 checked on TIMS, no FC found on 15/04/2024. Checked on CCD shoes & found #1646 A2 CCD bad arching marks. Replaced #1646 A2 CCD shoe. Checked/measured CCD fuses, CCD cables, line breakers & charging resistors - All OK. OPS 20 raised to follow-up.  Aliff/Daniel/Redzwan 45398