Maytag Bravos MCT washer stopped working and can't activate diagnostic test modes

I have a 2015 Maytag Bravos MCT Washer that stopped during rinse and drain cycle with a amber flashing sensing light. I held start button for three seconds and light goes off and then unplugged for a minute and plugged back in. Amber sensing light comes on flashing but can't get any cycles to work. Tried accessing Service diagnostic test modes via service tech instructions but can't access. Any suggestions on why I can't access diagnostic modes?
Thanks much!

via Maytag Bravos MCT washer stopped working and can't activate diagnostic test modes
by brine