I've got a Hotpoint 9.4 chest freezer and I'm finally getting ready to do some drilling. I want to keep the CO2 tank outside the keezer and put the gas lines through the edge of the door. I noticed the back of the freezer has an existing hole with a plastic cover (picture attached). The hole is a couple inches deep and all that's visible is insulation. Does anyone know the purpose of this hole or if it signifies the electrical line for the led light is nearby?