Is there a way to repair a corrupted save file?

There isn't anything I can think of to fix the save itself. The game does keep a copy of the last 5 versions of a save if that helps any. To access them, you go to "Load Game" from the main menu. Select your save slot. To the left of the play button is "Recover Save". This opens the list of past save versions. Clicking on any of them copies it to a new save slot with "[Recovered]" appended to the name. From there, you can load it like any other save.