Quite likely the steering rack is leaking PAS fluid from the gaiters at one or both ends. Once confirmed with a visual inspection you can try additive that you put in the fluid tank that plumps up the seals and will delay the inevitable. It it is this, eventually the steering rack will need to be replaced which isn't a cheap job.
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Present: 2009 Volvo V50 1.6D DRIVe SE
Past: 2004 Volvo S40 T5 SE
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