Here is a write up on how to change the pressure regulating valve and boost valve.
Remove the transmission pan and filter
You can see snap ring at the bottom of the boost valve.
Remove the snap ring and pull the boost valve out with a pair of pliers. 2 springs and a washer(spring seat) will come out with the boost valve.
With the boost valve out, you can grab the bottom of the regulating valve with a needle nose pliers, being careful not to scratch the bore.
Here you can see the difference between the factory parts and the sonnax replacements