I have a 2012 Keystone Avalanche 330re that has a keyless entry system (southco r03). I had to replace the keypad on the outside, but, the receiver is still paired with the old keypad. I found the directions on the Southco website on how to pair the receiver and keypad, but, that requires access to the receiver. So, my question is where is the receiver? My guess is that it is in the core of the door. But, didn't want to start taking it apart until I knew that's where it is.