You really need to scan the car to see what the issue is.
I suspect that the problem with the rear door is the door state confirmation microswitch, built into the door lock module and due to its location, it gets a good dose of spray lube when the steelers kindly lube the door locks. That or a dry joint on the circuit board in the module (microswitch is more common though). You can probably clean the microswitch up with some contact cleaning spray (solvent based). Though you do have to completely disassemble the door to get to the module, you may be able to spray clean the switch as it is located just below the actual catch.
Does sound like you still have a power issue on the ccm and the dealer didn't fix it properly or the problem has re-occured. So you need to check the fuses and fuse holder, I doubt if the ccm is powered by a relay as it is on all of the time for the alarm and remotes. Best bet would be to get hold of the circuit diagram, I know Haynes cover the Mark IV Golf but not sure if it covers the Bora (though most of the wiring is probably the same).
Good luck,
Paul