Train doors at car 1669 were not provenclosed. TC recycled train doors twice- ok. Staff(MSL) checke d and confirmed train door not closing intermittently. Faultdid recur at subsequent station. TC recycled train doors a ~~~~~ Train doors at car 1669 were not proven closed. TC recycled train doors twice- ok. Staff(MSL) checked and confirmed train door not closing intermittently. Fault did recur at subsequent station. TC recycled train doors a few times but to no avail. Staff(MSL) isolated the defective 'B2' doors at car 1669 in close position. Stock change arranged at AMK NB  Check and found #1669 B2 door lintil cover rubber protrude out aand cause door open/close intermittent stauck, Re-align lintil cover rubber and door function test ok. Door static test pass. Done By:Koh/Rizman Date:22/11/2023