I had a tune done at Nelson about a year ago on my 08, 5.3. I want to get some warranty work done, and I am having problems trying to put my spare ecm and tcm in. I'm not sure if it's me not doing the security relearn right or if there is a problem. Is there another way to do the security relearn, by going to a shop or something? I'm in Austin, what are my options? Any help would be appreciated.