Mavic Ksyrium Equipe comes with a recommended spoke tension of 140-160 kilo. Quite a lot by almost any standard.
I didn't have any problems getting a replacement rim, but had I had to pay anyone for the replacement work I'd probably have opted for buying another wheel instead. And yes, it was a crack that prompted the replacement.
Mine was definitely not still under warranty. Whether the OP would measure up for that treatment I have no idea.