The only thing you want on is the light. It's a shuttle valve that senses pressure imbalance between the two systems. When you have a leak pressure in the good side pushes the shuttle to the leaky side and turns the light on. You are not bleeding it. You need to open a bleeder on the side that was still good and use the pressure in the other (repaired) side to (slowly!) push the shuttle back to the center where the light will go out, then close the bleeder without allowing any air back in. Only a small amount of fluid will need to be bled off. If you go to far the light will come back on and you have to repeat by bleeding the other circuit.