Hello to all! I need help on all the wiring hookups in a single, "three switches" gang box in a bathroom. When installed, The three on/off switches will control a heater, a vent, and a light (The light to be controlled by two "three way" switches). Four cables now come into the box as follows: 1. One 12/2 cable is the POWER SOURCE IN FOR ALL THREE ITEMS (Heater/Vent/Light). 2. Another 12/2 is wired to the light fixture. 3. One 12/3 cable is wired to both the heater (connected to red wire) unit AND the vent unit (Connected to black wire). 4. Another 12/3 cable comes in from an already-installed three way switch at the other location. I believe that all of my finished connections (at the Heater/Vent/Light Unit and the at the other three way light switch) are done correctly. Please clearly explain all hookups in the box - including those on each of the light switches themselves (which wires to which screws). Thank you!