TC reported DIR lighted up. TC opened and closed all doors to no avail. TC opened and closed both ca b doors - ok ~~~~~ TC reported DIR lighted up. TC opened an     Checked #3539 cab door found A/S top latch mounting loose.Tighten top latch mounting screws and adjusted door latching overlap to 6mm.Carried out cab door function tested -ok. Done by Kumar/Jack/Sateesh. 29/04/20