Having a Pre-lit Christmas Tree Restrung?

I have an expensive and beautiful artificial tree (9 feet tall). The lights worked great for three years. Now some strands are burning out. I always replaced burnt out bulbs as soon as I saw them, but with an extensively decorated, very full tree, obviously I did not catch them until it was too late and the entire strand or half the strand burnt out. I was trying to search online, but cannot find if anyone or any place that offers a service to take off the old strings and restring an artificial tree. I live in the west suburbs of Chicago. Does anyone offer a service to restring artificial Christmas tree lights?

By LSH