Interesting you should post this, I'm in a similar position. Where did you get you RCD510 and CAN from?
I got my RCD from a forum member here in Australia. It is the Bosch version with RVC connection but no USB. - I do not have RVC installed.
I got my CAN from Bold-Sport.com; however, as mentioned at the moment my original CAN is back in the car. How long does it usually take for the battery to drain if there is the battery drain issue? I hopped in my car this morning and it started fine, even though I have my original 1K0-907-530-E 0110 gateway installed.
So strange!
I am not sure about the alarm fault, thats a strange one in it self considering the Siren works. I tested it yesterday by putting down the window, locking the car and then setting it off by waving my hands inside the car. This suddenly came up after an Accident I had in 2012 where the front of my car sustained some damage. It was minimal, Radiator etc.. did not need to get replaced, just the plastic bumper, lights, fogs etc...
The drain test was done with the car locked in the following fashion.
1. Open Bonnet
2. Lock bonnet latch using screw driver
3. Lock Car
4. Disconnect negative battery terminal
5. Connect positive multimeter lead to negative battery terminal
6. Connect negative multimeter lead to negative battery cable (now physically disconnected from battery)
7. Turn multimeter to 10A setting and observe reading.
As mentioned, the reading started at 1.75-2.00Amps for about 2 minutes then it rapidly dropped to 0.2-0.35 then I left the car. I came back after 35 minutes and it was reading between 0.00-0.02, going up and down. I observed this for 5 minutes and then disconnected it all, im not sure if it would have spiked again.
In regards to Eddy-NL, hopefully he see's this post. I tried coding out the battery regulator module for hours and hours... I have not been ablt to do it. At the moment the new gateway is just sitting here on my desk useless. Although, maybe I don't even need it? But I cant believe that my original E gateway magically works and no one else's does... its all a bit weird.
Essentially I used to be able to leave my car for 1 month and it would still start..
The battery is relatively new, March 2013 and has only been draining totally once.