On these cars, the most common culprit is the high-pressure hose. My wagon was losing fluid bad, and there was far too much gunk to determine exactly where it was leaking, although there did seem to be a lot of fluid on this hose. I replaced it and the leak is gone. The replacement hose was like $35 at AutoZone. It's REALLY difficult to get to the end of it on the pump, but I removed the hood which made things a lot easier.
AUTOZONE LINK
__________________
2011 Regular Cab, 4x4 Auto, N-Fab step bars, Satoshi grille, OEM fog lights, Extang Trifecta cover (list growing, check back often!)