TC reported unusual noise coming from train doors at Front DT . Staff(KTB) checked and confirmed no train doors abnormalities. Fault did not recur at subsequentstations. TC reported unusual noise coming from train doors  ~~~~~ 3609 reported unusual noise coming from train doors. Staff(KTB) confirmed no train doors abnormalities. Fault did not recur at subsequent stations. CE: 3609 all doors operation ok no unusual noise detected. Depot to check Refer mo:11829489.  3609 A1 Door. Checked 3609 A1 Door - No FC recorded. Checked & found A1 Left A/S door outer roller delaminated. Replaced door roller.Clean J-rail guide rail. No FOD found. Weather strip - OK. Door cyclic check - OK. Door gap 63.9mm. Door open/close timing - OK. No DIR lit. All doors proven closed. Sarma/Sugu/Anand 45241