1990 Lincoln Continental repair of solenoid value on air sh

I have the right rear air bag going down with an audible leak intermit that I believe is coming from the solenoid valve. I have not been able to verify the location for sure cuz it only does it part of the time and when I have the wheel off to check it it does not leak. How do I remove this solenoid and repair it with the new o ring kit I got from Arnott industries? Thank you.