Been having major problems with tailgate on Vreg TD5 - the outside Mech has been playing me up for some time, spraying WD40 work a little, but today I think the mech broke good and proper when I slammed it shut - wont open at all. Have had the inside panel out and can see the mech isn't engaging - understand this could be a spring issue? Problem is I can't see how to unlock the door to get at the inside - Can anyone give me instructions or a photo link to show me how to unlock the door to get at the mech. thanks