Control module, Missing In Action. Where is it?

[bobswei]

I have a 2008 Cayenne S with a draining battery. Local shop traced it to a "comfort control" module. He replaced one in the right rear but that wasn't it. Even though, these modules are called the same thing but are different. Like, the rear BCM (body control module) is also referred to as a comfort module. Then there is the KESSY module, same thing.
So, where is this module located on the car?
Thanks:

[bobswei]

Ops, photo didn't load: OK, won't let me load phots. It's the comfort control module. Not the one in the right rear. I'll try later.