Hi, Jim.
Why would you want to have the lens checked in the first place?
Did you see any problem from the pictures you're getting out with the lens?
Most lenses already went through a QC in the production line. Unless you/the previous owner dropped / modified the lens in a way, I don't think you need to have it checked.
I think it's just a waste of money.
I suggest try it first and see if you can see a problem with it.
I have the FA*24/2 also. It's a very good lens. Very high contrast and fast AF.
It's hard to miss focus with a wide angle lens like this and if it does need adjustment and you have a K20D, you still can adjust the focus manually without having to go to repair center.
My thought is, if I can't see a problem right now with my lens, would I be able to tell the difference after it gets repaired? Most of the time I won't.
You'll be better off to use the money to buy a more useful photography accessory, for ex: reflector, lens pen, good neck strap, etc.