I am also having this problem but I've had it before and I replaced the pump when I needn't have. Last time I noticed the little mesh filter under the pump had been clogged up with algae type stuff.
I suspect that's what's happened again but I'll update once I've had a look. It's a wheel off, arch liner off job.
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07 Silver D3 A/S8L Quattro  S8 front end, Xenons, Bose, Bluetooth, Voice Control, Autodim mirrors, Heated folding mirrors, Double Glazed Windows, Electric Rear & Side Blinds, Black leather Comfort Seats with front memory seats & mirrors, Front & rear heated seats, Interior/Exterior light pack, TV.I.M, AMI, Parking sensors Front & Rear, Air suspension (soon to be lowered), Keyless entry & Start/Stop, 4 zone climate control, Power Boot Open/Close. 
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