I was gong to comment on the worn tensioner pulley too - wow - but it didn't seem relevant.

Re. the leak, isn't the first picture the underside of the power steering pump? If so the leak could even be something as simple as a leaking bleed screw...

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)