Train doors at car 1609 were not provenclosed. TC recycled the train doors once - ok. Fault recurre d kept recurring. Staff(AMK) checked and confirmed that car 1609 'B4' doors were slow in closing. No object was observed ~~~~~ Train doors at car 1609 were not proven        Check and found #1609-B1 LHS door roller was damage.Replaced and done all the static test and function check ok. Done by Imran/Faiz  11/08/22