replace blower check valve

Igot a 92 cal spa.Ineed to replace the air blower check valve.I dont know how to remove it.Can you help me?

Please email me directly at mary@hottubworks.com. I cannot locate any plumbing diagrams for this spa. I would like to see a picture of where the blower is located which I believe should be in the front right corner but need you to please verify that. Thank you, Mary