I think you unscrew the bolt on the bottom bracket, and there may be a second underneath. The door should drop out and the fixings in the top edge may transfer to the other side. If so then remove the bolt at the bottom right, transfer the bracket and either replace bolt or use the one from the left side if it is longer and the fix under bolt. While loose or possibly while off place hinge pin in top fixing and tighten up. I have to do this next week so if you are concerned post note and we can see how I get on.
George, August 2008