With the Motherboard out, it's a quick fix to replace the charging port. Flip the board over to where the solder connection are available to work on.

The solder points that you should be working on are easy to identify as flat bits of solder on the back of the board, but they are highlighted in the photo.

Heat all the solder joints until the solder melts and then quickly pull the component off of the board. I recommend fully cleaning the solder joints and applying fresh solder when your replace the component.