I was told after calling around and everything that if you try to fix the mower at all it voids the warranty. I was also told that if its the carb that its not a husqvarna problem and that you have to take it to a certified place that repairs the maker of the engine. and it would be repaired by them under warranty.
I am Running into the same problem that you are with the same mower. I have called lowes and they told me it would take 3 weeks unless i took the mower to the place to get it fixed myself.