I have a 5x5 Rubik's Cube in a similar situation to this previous post - entirely solved, except for a pair of swapped edges: Swap the edges in a solved Rubik's cube.
However, since it's a 5x5, it's the full edge (3 pieces) that's swapped:
It must be some kind of mistake, and I suspect that one of my kids swapped some center pieces. All six centers have removable faces, but no other pieces do. What I should do?