I have cpflight MIP 737 control board. I'm using the iFly 737 model. All works except the BELOW GS/P INHIBIT light on the pAnel. When I use the test hardware software it lights up fine, but in use it does not work. I'm stumped. I am not using a pushbutton because it does not seem to be required according to the installation manual. I believe it should work just as the speed brake armed light does. Any thoughts are appreciated. Thank you.