Eric
It would depend on what needs to be done. If the horizontal (infinity) focus is off; I think that can be adjusted without taking the top off. I can't recall about the vertical adjustment, whether it is accessible through a screw in the front of the top cover. If it is accessible, then it can be adjusted without taking the top off, and the price should be lower.
If the top has to come off, then you are facing higher costs, and if a tech is going to take the top off, you may as well get other things done, like check out and lubricate the shutter mechanism, the film winder mechanism, etc.
What needs to be done?
I thought full CLA's were in the neighbourhood of $400.
regards
Vick