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Q: power steering pump noise on 1996 Audi Cabriolet

I have a 1996 audi cabriolet that has a rattle noise that seems to be coming from the power steering pump. We replaced it with another used pump but noise is still there. Is there something else in that area that would make the noise or is this a problem with the ps pumps ?
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I'm sure you have checked the obvious, is the belt sufficiently tight? Has the system got the correct Audi fluid G002000/G002012 fluid not standard ATF like conventional cars. Does the steering effort seem normal or does it chatter or seem stiff to operate? The pump pressure may need to be checked it puts out between 1450 to 1600 psi.
belt and tension are good, fluid is correct, no evidence of steering issues, just the rattling noise. Noise can be heard with stethiscope on pump. Would low pressure cause it? The noise is not rythmic, sounds like a bearing
in an idler pulley when it gots dry and starts locking up intermittently.
make sure the noise is accessory driven by running the car without the serp belt. does it change when turning the wheel? the water pump is right below the p/s and the a/c and tensioner a little lower.
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