250 Pro XS Cracked head

My 2008 250 PRO XS had lost low end. Had replaced all fuel lines and plugs. Still not fixed. Rebuilt pulse pump and was test running on the muffs and noticed water coming out of the top left head below the sparkplug. It looks like a hairline crack. I posted a pic (if it works). Already ordered a new head and have it set up for the shop on the 28th. Two questions: 1) What would cause this? 2) Will warrenty cover it?
Also the motor has around 480 hrs and has warrenty untill 10-12
Thanks

http://im1.shutterfly.com/medi...3D400/

A buddy of mine had the same issue with his and it was covered
http://www.bassboatcentral.com/smileys/thumbsup2.gif
Scott

This would normally be covered if the engine is still under warranty.

Usually occurs when fuel rails aren't properly torqued (or haven't been retorqued).