APS at front M1. Aux-On to clear fault.Fault recurred while departing all stations. Staff(CCK) chec ked and confirmed no abnormality at front M1 car. Train was reformed with T202 and withdrawn as scheduled at AMK. ~~~~~ APS at front M1. Aux-On to clear fault.     #1724 FC 408/410 (MULTIPLE) Further check found a/c 1-2 V/U/W to ground insulation fail.Isolated and tagged.Notication raise for CCU c/o.#1724-n0 reoccurance of APS fault. #1724-A/C 1-2: Not: 2402884 raise to c/o CCU. Checked by Zulq.  27/07/22