My sister had some construction in her house and while doing the work they unplugged her ADT system from the power outlet. It was hanging for a while but the weight of the transformer eventually caused the cables to become loose and come out. Now there are 2 cables a red and a black one. The transformer has 3 screw locations, AC, GND, AC. Wondering if anyone else has this system and how their colors are connected to each location. She called ADT and they want to charge an arm and a leg for a home visit.