If you want to repair it for the experience, go ahead. (I've never tried it, but those big FETs might be hard to solder to a board with a lot of little surface mount components nearby.)
If you just want a new Jaguar, follow
this procedure to set the RMA process in motion. TI will generally replace them for free if the failure is consistent with a number of common failure modes—however, I just saw a notice saying "June 11, 2010 is the last day RMAs will be accepted for Jaguars received in the 2010 kit of parts." If they don't keep taking RMAs for the "grey" Jaguars (i.e. to keep the customers happy), they may end up giving a lot of business away to IFI (which has historically had good customer support for failed units).