Good find - thanks! It looks like there are two fare codes: LXRLPY for $359, and LWRLPY for $409, with a $250 surcharge for both. The travel period is 1/25-2/29. The same fare bases are from IAD as well for $40 more, but on a 777 rather than a 747.
I can't get it to show up yet, but I will look for it.