Frigidaire Dishwasher - Sanitize Option Not Working

I have a Frigidaire FPHD2492KF0 dishwasher. All the wash cycle options work except sanitize. When I select the sanitize option the unit does nothing - LED does not light up nor a beep or error message. It simply acts as if the button was not pushed. I read through the parts breakdown and figure I need to replace either PC Board Assembly (5304475569) or Console Assembly w/ Overlay (5304475578). I’m not sure which because I can’t figure out how to test either. Any suggestions?