There's another write up floating around that explains that because of the mechanical action the solder can crack on the two biggest contacts on the board. When I did mine I cleaned the contact and laid some fresh solder on them to be safe.
I actually enjoy soldering, I've been a soldering fool on this Focus. haha
Fox Hound: Liquid Stang - Sniper Focus - Decoy Escort (or was it a Tracer...)