Hallo Reagan...
A lot would depend on the camera, where I was sending it, and what I was paying. A CLA from CRR in Luton amounts to a complete overhaul, including new blinds, new rangefinder parts and so on, effectively restoring the camera to as-new condition. One pays accordingly.
But, for a basic CLA I would expect
Lubrication of mechanical parts and removal of old grease.
Shutter set to correct speeds.
Rangefinder/lensmount set to correct focus/distance to film.
Replacement of worn seals, if required.
Cleaning of viewfinder interior.
Check/Calibration of meter
I think that cosmetic cleaning, work on interchangable lenses, new shutter blinds and changing battery types are beyond a basic CLA and should be charged as extra services. In effect a CLA should result in a smoothly working, light-tight body. In practice this has not always been my experience 🙂
Cheers - and Happy Christmas to all! - Ian