I just checked the RJ45 connector on the latest batch. It's going to be hard (impossible?) to resolder the mechanical pads just with a soldering iron. Heating the board from the bottom is probably your best chance.
I've made a note to extend the mechanical pads from under the part so that they can be more easily reworked.
I've made a note to extend the mechanical pads from under the part so that they can be more easily reworked.