[A4] Intermittant groan from the front-end...

[gt40]

I have an '01 A4 1.8T that's developed an intermittant groaning 
from the front suspension that's definitely related to turning the 
steering wheel.  You can also feel it through the steering wheel.

With 180k miles on the cr, I imagine one or more of the balljoints 
in the front end have worn out.  Can these be replaced 
independantly, or is it time to replace the control arms?

(Keep in mind I'm VERY experianced with working on cars, having 
built a few NASA race cars in my lifetime.)

-- Robert 

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