There are no carrier "lines" as such, just carrier dogs so that's why it wouldn't be fair to name any particular line or affix publicly. There are obviously known carrier dogs from the working side just as there are on the show side but that does not mean all dogs from a particular line would be carriers - some would be but not all by any means. I'm not sure why you think your own carrier gets her faulty gene from the show side - it could have come from anywhere in her pedigree but without test results for all her near ancestors, you will never know for sure.
If anyone wants to pass on info about carriers to John, please could they do this by PM please, unless the info is in the public domain (ie via published test results)