Green Power Light

I notice that when I print in soliprint that the power lights on my press will fade in and out.  Then when I print in RH the glow is steady and unchanging.  That leads me to believe that there is an extra serial command that soliprint sends to control the green power lights.  For fun, I want to add that command to my RH start script.

I don't have my printer in front of me this morning to test, but I found a few clues in the source code.  Nothing about lights or LEDs for the Printrboard motherboard, but there is an output pin defined to tell the attiny chip to do something.  I seem to remember it mentioned that this attiny chip is a new addition, only for the Press.  If the attiny is the controller for the lights, then codes M100 and M101 would seem to control the lights.

#define PRINTING_PIN         PIND4            // OUTPUT tell ATtiny we are printing

        case 100: // M100 - set printing status
        {
            digitalWrite(PRINTING_PIN, HIGH);
            SERIAL_ECHOLNPGM("Print started");
            break;
        }
        case 101: // M101 - turn off printing status
        {
          digitalWrite(PRINTING_PIN, LOW);
            SERIAL_ECHOLNPGM("Print ended");
            break;
        }