Train doors at car 3606 were not provenclosed. TC recycled train doors once to no avail. Station st aff(CBR) push to closed car 3606 A4 door for train to depart . ~~~~~ Check Tims observed FC-083 happen multiple times. Further check found A4 door no FOD observed.
Push/pull resistance 15kg. Remove both side door leaves manual check, found left side door when fully open resistance very high. Remove left door found main roller rubber give way with bearing and knocking sound.
Rear roller rubber with minor cut, replace both rollers.
Door cyclic ok and door static check ok. DCS & DLS ok.
Done by Koh. 25/08/21.