My '03 LTZ w/ 88K lost it's power assist on right hand turns. It started with momentary loss like after backing out of a parking spot. Now the power assist is basically non-existant for RH turning, although it works perfectly fine turning left. Added some Lucas magic leak stop fluid and it made it worse, then I flushed it and it's back to just pretty bad. I figure it may be a plugged valve. I don't really want to tear the rack out... anybody seen this before?