The 45mm Marzocchis don't like a lot of torque on the lower triple clamps. 10-12Nm will suffice. Make sure everything is aligned. Remove the forks from the bike and try to isolate the sound to the fork alone. Depending on when they were last serviced, perhaps consider some fresh fluids and checking things out internally while you've got them off.
Thats where I'd be heading.
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