Rubik's Cube - How to swap 2 middle layer pieces, it can affect the top, but not the bottom

Question

While solving with CFOP, I have the following situation.  The bottom side is solved.  On the front face, I have the left-center and right-center pieces swapped.  How can I swap these pieces?  I know that this will affect the top face.
I realize by swapping them, they can face either direction, since an edge piece can be oriented 2 ways.  Therefore, I could use 3 separate algorithms.  (One for same front face switch position, one for left front to become the right front while the right front gets flipped to the left, and one where the right front becomes the left front while the left front gets flipped when moved to the right).

Baalbek · Answer

Whenever I have a middle layer edge piece reversed in place OR in the wrong position altogether, I lift it up to top layer with R Ui Ri Ui Fi U F. It has to be on the right side of the front face at the start.
To get it back in the correct position, start by aligning it with the correct side by rotating the top (U). Turn the cube so that that side with the aligned piece is the Front. Then see whether you need to go to the right or left. If you need to go right, first do a U, then same that you just did: R Ui Ri Ui Fi U F.
If you need to go left, first do a Ui, and then do the mirror: Li U L U F Ui Fi
Sorry! Just googled CFOP :D

Rubik's Cube - How to swap 2 middle layer pieces, it can affect the top, but not the bottom

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