Thanks all. Got the XKR out yesterday from under it's winter blanket and ran it a bit. Checked out the leak and found a little fluid right underneath the reservoir so it might be either the reservoir itself or the connectors to it. In any event I dropped it off at the shop today for them to fix it.

I'd been considering finding and independant service shop but haven't had much luck finding one that seems like they have much Jaguar experience so its back to the dealership one more time. If anyone knows of a shop in the Northern suburbs of Chicago.....