How to replace your seals in a Culligan Water Softener.
Seal pack replacement. The end contains a URL which is a forum. The post/thread has a link to a very good manual that shows the function of the valve system. Don't be afraid to take this apart, it ain't rocket science! Bypass the softener first, run it through a cycle to depressurize it, unplug it to avoid shock!
My symptom was no draw from the brine tank (using no salt).