Train doors at car 2507 were not provenclosed. TC recycled train doors once - ok. Fault did not rec ur at subsequent stations. ~~~~~ Train doors at car 2507 were not proven L3  Checked and found DIRBS was operated. Normalised and sealed. ER downloaded into RSD/BSD PTU 006. 2507 A3 door fault able to be duplicated in depot, door unable to close during door cyclic. Check DMV    coil ok, voltage opening and closing ok. 2507 A3 door LHS slightly wobbly and door roller found to be slightly damaged, RHS door ok, roller check ok. Replaced LHS roller, ok. 2507 A3 door actuator found having internal knocking sound when manually push/pull. Replaced door actuator. Checked and serviced guide rail, J-rail ok. No sign of FOD, Conduct door cyclic few times ok. No recurrance of fault. Conducted 20mm passed, 10mm failed. Adjusted to criteria, ok. Conducted 10/20mm again satis. Door static test satis. Door Actuator Old SN: 110170 New SN: 110167 Notification to CSC: 2508646 Done by: Zulqarnain, Asruddin