I actually have reflashed gray jaguars with the CAN bootloader. I used the RDK-BDC CAN eval board from luminary micro.
http://www.luminarymicro.com/product...ation_kit.html
I think I bought mine on digikey ($219 but it came with a jag).
However make sure that you've actually bricked it. When the bootloader doesn't recognize a valid app (bad checksum or maybe black jag firmware in gray jag) the firmware stays in bootloader ready to flash another app. The problem is that when its in this state the firmware does nothing with the led so it looks like its bricked. you've probably done this already but try flashing different firmware into the problem jag, also you may want to separate it from the other jags so its the only one on the CAN bus.