Just happened to me, too, at 52K miles. Fortunately it happened in a parking lot full of people with jacks and tools!
One person even knew about this problem, so he told me I probably had a loose PSF line nut. I was able to tighten the high-pressure hose nut, full it up, and limp it home.
It's still leaking fluid, though, so I guess I'll get it up on ramps and try to clean it up and tighten it better. If that doesn't work, is there a more permanent fix? I'm not willing to keep tightening that stupid bolt every 3 weeks.