TC reported intermittent "Obstacle Detected" indication at rear M2 car near B1 train doors. No DMI i ndication was observed. SM(KTB) assisted to check and feedba ck no train doors abnormalities. Train was reformed with a s ~~~~~ To follow up rectfy.  2616 B1 door found LHS door rollers faulty. Replaced the rollers. Function checked door operation - OK. No DMI illuminated.  Syahid/Raja Faiz/Tarmidzi/Hashim/Faiz 45047 2616 TC reported intermittent "Obstacle Detected" near B1 door. No DMI indication was observed. SM(KTB)assisted to check and feedback no train doors abnormalities.  2616 B1 door checked/found no FOD. Checked J-rail/guide rail no abnormalities found. Performed door cyclic test - OK. OPS 20 raised to follow-up.  Shamil 45045