Power steering fluid leak

[sLADe781]

UPDATE: Sorry I didn't update this earlier.... So I couldn't locate any leaks under the car and when I re-checked all my fluids (power steering fluid, oil, clutch fluid, brake fluid), everything was still full. Only thing I didn't check was the tranny fluid but I don't think it's that because I didn't see any leaks around the area (and plus, I'm still able to shift). I also don't think it's the coolant because the fluid was brown. So yeah, I guess I'm back where I started....what could it be? I haven't seen leakage since that one day so should I keep searching or just leave it be?