940 power steering question

[Aidan]

Hi folks, like most Volvo's I've driven, the steering on mine is somewhat heavy compared to typical US or Japanese steering, (its about right compared to other Volvo's) I'd like to get it a bit lighter. Basically its a case of increasing the fluid pressure, has anyone done this or know how to do it, I'm asuming its possible to alter something such as a pressure relief valve spring in the pump or rack??? I've had a search through the FAQ's etc but haven't found anything on this so any info would be much appreciated, thanks,
Aidan.
BTW, its a '95 940 SE wagon with an LT6 2.4TDic auto RHD