I did. You will need a high-wattage iron for the heavy connections (bus bars and relay contacts). I used a 180 watt butane-powered iron. My 45 watt electric iron wasn't even thinking about getting the job done.

After fixing all of the heavy connections, fix the small ones. They won't be cracked, but the parts will move around when you solder the heavy connections and if you don't resolder the small ones, they will break later. They did for me.

I removed all of the old solder with solder wick, and replaced it with new eutectic (63/37) solder. I wasn't comfortable just reflowing the connections.