Came back from a nice drive down to North Carolina 2 days ago. Backed the GT out to wash her, and heard a loud "whinning" noise when I started the car up. Turned the steering wheel both ways and the noise increased a bit. Checked the power steering fluid level, and I think it is low. I'm not sure where the min-max level indicaters are in the reservoir, but the level is below a dark line around the inside of the reservoir. I'll pick up some Mercon ATF tomorrow. Any other thoughts on what could be causing this? Thanks.