Which year's xscream series do you have? Is it the newer one with the Y + V prolinks or the older one with the straight ones? you will have to describe a little bit more what happened but it sounds like you could warranty the entire ski. Prolinks cant be replaced i dont think, especially on the xscreams because the newer models have the prolinks through the top sheet and mounted to the core (or something close to the core). Did you break the piece closest to the binding or the other end of it? You will probably end up taking it to a shop, if i were you i would warranty it if it is looking serious, but ski on them for the rest of the season if it is possible so you arent without a pair of skis for a long time because salomon tends to be slow when warrantying skis.