@shagybruce,
email me for details > mk14sei(@)gmail.com
As for the sheared pin, there is a reason it sheared.
Have the tech replace the 3 'O' rings on the piston and replace the entire brine injector. The brine injector has 2 small 'o' rings that can be replaced, but the injector tube is usually brittle and cracks when pulled.
The service tech should also replace the brine & drain shut off tabs plus any associated parts that are worn or corroded.