Train encountered power fault at rear M2car while arriving station. Reset - ok. ~~~~~ 2536 encountered PF while arriving station. Reset - ok. Recurring fault, to check and rectify (OE).  2536 FC 141 (Propulsion 'K' failure).    Replaced 'K' contact unit & L1/L2 contact tips. Visual/meter check charging resistors - OK. CCD height/fuse/cable/shoe condition check - OK. Limited/depot shunting & #2536 no power fault indication. 'K' contact unit S/N : OLD : 1020363 NEW : 1021708 CCD Height (#2536) : A1 = 200mm, A2 = 200mm, B1 = 202mm, B2 = 204mm  Chan SW/Hanafi 44257