I could not find a service manual for that model, only a tech sheet. Looking at the NFW7200TW10 Diagram
I would say you would want to remove the top, control panel and front of the washer to replace the pump.
At first it looks like it maybe quicker to access it from the back but I think you may have trouble reaching it if you can even really see it good from the back. At least that is how I would go about it.