ALL train doors and HHPSD proven closedbut DIR remain lit. No indication of DMI. Open bothside ca b doorsbut fault remain. Operate ADBS unable to clear faul t. Pax detrain,Operate DIRBS. ALL train doors and HHPSD pr ~~~~~ ALL train doors and HHPSD proven closed but DIR remain lit, no DMI.  L3 Fault symptoms was duplicated in depot. No fault code and train door error status at TIMS. Faulty door was identified by isolating each doors individually (1712 A4 Found #1712 A4 (DLSS-1) limit switch (NO) for DIR contact plate broken. DIR loop thus unable to close and energise due to broken contact. No fault alarm were triggered as input for Door Lock Switch status runs on a separate switch (DLSS-2), which was working as intended. Replaced faulty 1712 A4 DLD. Fault cleared, DIR able to extinguish. Checked all 48 doors lock switch and performed door cyclic test - satis. S/N: C151BDL162061 (O) C151CDL17X47 (N) Notification to CSC: 2550034 Done by Jack, Sanip, Koh. 08/11/2023.