Vauxhall Insignia squeak from power steering?

My Insignia has developed a strange "squeak" when putting my foot on either the accellerator or brake pedals. Its been into Vauxhall 3 times now, who have replaced something (a pipe I think) on the Power Sterring, they tell me its a common issue, however, the noise is still happening and now they have to see the car for a fourth time! Has anyone else experienced this problem / or just heard of it, I cant find much on the interweb. For some reason they want to download some information from the car for Vauxhall when I take the car back in, even though it appears to be a mechanical, not computer, fault?

Thanks In Advance

David