Train encountered power fault at front M1 car while arriving station. Reset - ok. Fault recurred whi le arriving JUR and departing JUR. Reset both times - ok. Tr ain performance - ok. ~~~~~ 1612 encountered PF arriving station. Reset - ok. Fault recurred while arriving JUR and departing JUR. Reset both times - ok. Train performance - ok. Tan Hiap Seng (OE BM) : raise M/O to download FC and rectify.  1612 having frequent power fault. ER & Fault Trace D/L. Checked CCD shoes/height & CHRe - OK. Insulation test on bogie #2 motor - OK. Unable to measure bogie #1 motor. Checked K1/K2/L1/L2 contacts - OK. P3 check (no power test) failed on #1612. OPS 20 raised to follow-up.  Kana 44281  1612 filter reactor meggar check - OK. Fault still persisted. OPS 30 raised to follow-up.  Lee PT 44280  1612 Earth brush, EBR & ground cable continuity test - All OK. Meggar bogie #1 motor - OK. Swapped relay panel from #1612 to #2612 but fault still remained at #1612. Swapped control unit from #1612 to #2611, fault still persisted at #1612. Resistance test on INV1/INV2/BCH - OK. Checked for loose connections on all control cables inside propulsion unit - OK. Checked HB contacts/connections - OK. Found K1/L1/L2/K2 cam s/w terminal connections all loose. Retightened according to specifications. Reconducted P3 check - Passed. Limited movement & powering current was registered with no fault indications.  Kana 44281