Train encountered power fault at Front M2 car while arriving station. Reset at YIS2 - ok. ~~~~~ 2654 encountered PF arriving station. Reset at YIS2 - ok.    2654 check n found no pf. Car powering/braking currents ok. Power fault (x2)  FC 141(K1 Failure) FC 820/821/141 Checked charging resistor - OK. Checked coil measurement for L1,L2,K1 & K2 - OK Replaced K1 contactor due to K1 Failure (FC141) Megger (T/M) motor - OK. Checked CCD HT. & fuses - OK. Swop VVVF Controller bet. 2654 & 1654. Limited movement braking & powering current - OK. No other abnormalities observed. No power test performed - OK. S/N:K1 old (1048320) S/N:K1 new (1021708) VVVF Controller  2654 (S/N:502RBO-4H) VVVF Controller  1654 (S/N:502RBU-1H) Sugu/Alan/Kamarul/Anand/Lee PT. 45101