I've always used this diagram. The little squares with the diagonal lines show the connecting doors. We've had connecting rooms (requested) on 3 trips and they were always in the areas listed on this map. I don't know if anything has changed since the refurbishment, but I don't think it has.
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56 & 57 in building 3 are connecting too. I know because I just stayed there. I don’t see the connecting line on the diagram. They may have added it with the refurb.