Question- From a wear standpoint, is there a good rationale for changing throttle, prop, mixture cables, even if they are working ok? The reason I ask is that they are presently out from my plane (68 'C) to redo the panel and thus would require no added labor to install new ones. The throttle control looks original. I don't think the prop and mixture are, but they look old - I couldn't figure out from the logs exactly when they were replaced.
As a CB, I am not enthusiastic to swap them. But of course it would cost much more to do later. Plus a broken throttle cable in flight sounds like a horrible day. Then again, my new carb heat cable decided to snap after 40 hours - mysterious event, not sure whether manufacture or installation was faulty. So there might be a case to stick with tried and true?
EDIT: Dang it, just became aware of a 1970's service bulletin that applies to my serial number sbm20-174 (http://www.mooney.com/service-support/service-bulletins/model/m20c/) - requires replacement of all 3 controls. I don't see an AD associated with it. I obviously need to dig a little more - I suspect the bulletin was complied with, but I need to confirm. Even then, the existing controls are old...