The Lexus LX450 arrived with a pretty powerful stream of fluid terminating from below, and the best guess so far is the power steering oil cooler. Of course, the cooler consists of hard lines and therefore can't be replaced.
There's the possibility that the leak is coming from the power steering reservoir itself, as there's a few accounts online of a misdiagnosed leak being traced back to the very cheap fix of replacing some O-rings inside the tank itself.
My friend Jeff, a professional mechanic who arranged the sale of the LX450, said it's the hard lines going into the cooler. I have no reason not to believe him, so I tracked down a used cooler assembly from a place in New Hampshire that deals exclusively in Land Cruiser parts. I've also got an appointment on the books for the truck to go to the local Lexus dealer for this repair along with proactively swapping the water pump, thermostat, and drive belts while it's there. My good mechanic friend Joe Manzi, from the now-defunct Oxford Motorcars, will be handling this job, which I'm pretty psyched about. Joe's a great guy and an excellent mechanic.
The tags from Vermont should arrive shortly, and then we can get this thing some beach passes and take it on the sand!