6300 is the Low Profile Penguin model. THAT model will have the Board ON the AC unit. You have to remove the upper cover of the unit and then remove the Evaporator cover either Styrofoam or plastic, depending on the year of the Penguin. Once the evap cover is removed you will see a 2 by 4 inch metal electrical box in front of the evaporator. THAT houses the 120 from the inside breaker and connects to the 120 going to the Board on the AC unit. This is where you may have a burnt 120 connectiOn IF THE 120 AT THE MAIN BREAKER PANEL SHOWS 120 OUTPUT FROM THE INTELLITEC EMS MODULE. Since you have to go on top and your age, you may have to get either a professional or somebody that is very handy to do the roof top checks. Regardless, you NEED someone that can operate a multitester to check various 120 volt circuits if you are not handy to use one. Doug