Train doors at car front DT door A4 werenot proven closed. TC opened and closed a few times to clea r fault. ~~~~~ 3627 A4 Train doors door were not proven closed. TC opened and closed a few times to clear fault.  3627 A4 door found no sign of FOD. Door force checked at 9.8kgf. Cleaned J-rail & rechecked door force at 6.5kgf. Performed door cyclic test 20x & no fault was registered.  Kana 44304