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Hi,
You're going to have to remove the rear firewall to see above the pump. I suspect that what you have, from looking at the photo is a Coolant Pump Bearing starting to go bad. This will require replacement of the Coolant Pump.
But, to be sure, you'll need to pull the Firewall and look/feel around to see if you can isolate the source of the leak. I see from the pic that you already have one non-standard Worm Clamp on the system. This indicates previous work was done to the Coolant Pump or Oil Pumps as Porsche recommends replacing the OEM Spring Clamps with traditional Worm Clamps if the system is dismantled for any other service. Actually, on second glance, I'd be sure that the Worm Clamp in the picture is properly seated and tightened. It looks to be very close to the end of the goose neck and this could cause a bad seal and possible leak. Hope this helps...
Happy Motoring!... Jim'99
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