Track CPR will assist with associating replacement files with a batch of dead tracks. iTunes can perform this task, too, but only one track at a time.
The script will attempt to locate existing files (recursively) in a user-selected folder that have the exact same filenames and extensions as the missing files of a selection of dead tracks. Then, you can determine if the found files are viable replacements for the missing files and the script will perform the replacement.
In the screenshot above, the blue-colored files have been selected to replace the missing files of the corresponding set of dead tracks.
There is information in the accompanying Read Me that you should read. More information and download is on this page.