I took the front cover off just now to do my coolant change and found that the hose on the left a little back from the radiator plug is covered in what I think is ATF (smells a little like it, black when I wiped it off with a shop towel).

Here's a photo



I checked and hose at the top is also dark, so it may just be flowing down from there. The level in the reservoir is about at the bottom of the plastic indicator that's attached to the cap.

Is it likely the hose or the reservoir, or something else entirely?

EDIT: I haven't noticed any issues with steering, 04 4.4i

Thanks.