Mine does the same thing. I've looked and the joints are all sealed so a lube job would involve a tear-down of the suspension on that side unless you just want to replace parts until it stops. 
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1987 928S4 Silver Metallic (980)/Navy (TP) 5-Speed
2000 Boxster Speed Yellow/Black 5-Speed
1966 Wife White/Brown Top
1986 Daughter White/Brown Top (Sold!)
1992 Daughter White/Blonde Top
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