Train doors at car 3627 were not provenclosed. TC opened and closed a few times, ok. Staff (CCK) co nfirmed gap of A4 door at car 3627, isolated in closed posit ion. ~~~~~ #3627-A4 door adjusted door mating strip distance to 63.5mm. Push/pull 8.2kgf to 8.6kgf. Checked DLS ok, J-rail and door guide ok and no FOD found. Carried out door cyclic/function test ok. Checked by Zulqarnain/Koh. 28/07/20.