Can I go back in after I have already filed my return and see the information I put for the w2?

Ok so I already filed my return and now I received another copy of a w2 from the same place I included on my return but I am not sure if the amounts are all the same. I am trying to see if there is a way I can go back and view the amounts I entered so I can find out if I need to amend it or not.