Kitchenaid D/W - lights flashing

My Kitchenaid D/W has the light/china red LED flashing and won’t start or reset if I unplug. From some internet searching I see this is a somewhat common problem but I am having trouble diagnosing.

The tech sheet that was under the toe kick mentions a diagnostic cycle to start by pushing super scrub/air dry/super scrub/air dry - when I do this nothing happens.

What else can I do to diagnose?

thanks!

If you pressed the according buttons and they beeped and lit up each time you pressed them i’d suspect a main board issue