Heavy Power Steering 2003 2.0Hdi

Hi
Sorry if the answer is somewhere but I can’t locate it

So I’ve always had a weird notchy feel on left hand bends but I’ve just lived with it for ever without issues, but now the steering is heavy as hell but still has some power to it, fluid is all good so I’m wondering, Will it be the pump on its last legs

TIA 

If it is ! Where’s the best place to buy one from 


Many thanks