I have returned one game and replaced with another and my son still gets a warning that stops his game play which says "A corruption was detected and Brink is unable to continue loading. Please restart Brink and download the game add-on pack again." Of course he has done as instructed numerous times yet the problem persists. Help please.

Try deleting the game from your xbox HDD (If installed), including saves and the "Add-ons", then try to run it fresh from the disc by itself. If it runs, try downloading the add-on again. If it persists, check your disc, it may be dirty or scratched.

Re-downloading may not be enough, you may need to delete the files entirely.

As well, an odd but pertinent question: did your son activate the redeem code on an xbox other than the one he is trying to run the game on now?

I will have him try this and let you know, thanks. No, he only has the one X-box.

You may also need to clear the cache if that doesn't work, it'll mean you have to download any game patches for all your games the next time you play them, but won't delete saves or achievements etc.

http://support.xbox.com/en-us/pages/xbox-360/troubleshoot/hardware/clear-system-cache.aspx