I have a typical ding dong doorbell. The button is obviously at my front door, the chime is above my stairs and very unusual. It has 2 wires coming from the back that splits into a red and yellow wire. So there's 2 reds and 2 yellows. The bell has screw connectors that say, front, transformer, and rear. The installer installed one red to the front, another red to the transformer, and twisted the 2 yellows and wired to the rear. I want to rewire this and try to salvage the existing doorbell. Works fine but I want it to be wired right and not all amateury. Someone help me through this rewiring process?