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You will have to use the CFE cheat to fix the sloped floors.
Once the cheat is running, there are two main methods to flatten warped floors.
1. You can drag the floor leveling tool from a flat floor (on the same level) across the sloped area. If you just have a small area to fix, start from the closest point you can.
2. You can place a normal floor tile (carpet or whatever) on a nearby flat tile. The new piece of carpet will flatten the tiles around it.
You may also need to flatten floors on upper levels, if they have been affected. Then turn off the cheat.
It's not difficult, really, but takes some practice to get precision.
Hope it works out for you! Sorry I can't get pics for you at the moment.