URGENT - Steering Issues

[sd1800]

Dropping the car at the mechanic in a few hours but wanted to check the general consensus here first.

After doing a brisk uturn at a roundabout on Sunday, suddenly the steering started making a quite loud grinding sound. You can also feel the vibration from it through the floor.
* If the car is stopped and you turn wheel from lock to lock it will not do it
* Will not do it on slight bends. Only sharper bends such as turning into a side street or going around a round about.
* Will only do it above 20-30km/h
* Will only do it turning right
* When it does start grinding the wheel will not return to centre and requires some elbow grease put into it


Took it down to the mechanic to look over yesterday and he checked the bushes, bearings, ball joints e.t.c. and tightened all obvious bolts and it still does it. He said the rack is leaking a very small amount of fluid from the dust boot but by no means alot. Thinks the rack may be losing pressure but said with the size of the leak it would be unusual to present these symptoms.

I just want to confirm before I spend hundreds on a reco rack, that if anyone has had this issue before, and that it wouldn't be anything to do with the Speed Sensitive Steering or the Power Steering switch??