carpet is in great shape, just has a hump in the middle of the room....Of course it is out of warranty :-(
I had this problem with my living room carpet as well. There were two humps almost next to each other. One was longer than the other. I had a carpet guy come out and he wanted to restretch the whole carpet (12.5 x 22). I'm alone and couldn't possibly move all the furniture and books in there. They would do it but at more than double the price. So, I called a second carpet repair guy. Ended up I had to move 1 chair and he fixed it for a fraction of what the other company wanted. Moral of the story - I would get more than 1 estimate.