2556 During train prep A1 door not prove ~~~~~ 2556 During train prep A1 door not proven close.  2556 A1 door found unable to fully open intermittently. Checked door force at 12kgf. Cleaned J-rail & replaced door actuator. Re-tested door force at 8.5kgf. security/function test - OK. Door cyclic test 20x & no fault occurred.  Kana 44249