Try to do: file/open/select the SLDDRW file without validating, click on the reference button This will open a window that indicates the file(s) that is/are called by the reference.
You have to do the @stefbeno manip. Closed everything in SW, try to open the drawing without clicking on Open but on references and correct the main link if it is the only one that is wrong. Open, then save if the result is ok
In the window that appears, double-click on the line in error, the File Explorer window will open and you will be able to select another file. A word of advice, make a copy of your file before modifying it...