A month ago I had my 98 coupe in for an oil change and my Indy guy found a PS fluid leak. He changed the leaking hose and when I picked it up the steering was very stiff and wouldn't center without substantial assistance after making a turn. He told me to drive it for a couple of weeks as it may just have to work a little remaining air out of the system. Brought it back a few days ago and he found that a relief valve in the PS system had some dirt or debris that probably broke loose when the hose was changed. He cleaned it and flushed the PS fluid for good measure (at no charge!) and all is well again. Just wanted to share this in hopes it helps someone down the road.