It’s just a matter of taking one solenoid at a time off and the other two screws near the solenoid and replacing the rubber diaphragm, if there’s any mineral deposits on the brass part and the plunger inside, soak it in some CLR overnight, almost any repair manual for older automatic washers show how to do this almost all washing machines use the same style valve.
Other than that, it’s hard to answer your question. I don’t know your mechanical abilities.
John