Problem with key/remote/fob, VCDS 00955 Key 1

[dadomonster]

So one key "died" a few months ago and I thought the battery ran out, switched to other one I had and it died few days ago. Not really a problem as the car runs so few times a week. Well changed the batteries to both today and they won't resync. Sigh.

I tried 4 different ways (yes I know the "correct" way also what I have used before when battery from car was disconnected).

Problem now is that through VCDS I get following codes: (all up at first, then it dropped to 00955 or 00956 poppin)
00955 - Key 1
35-00 - -
00956 - Key 2
35-10 - -

No adaptation limit surpassed or errors, just blank dashes. When I clear them and switch Ignition off-on and recheck with VCDS the code 00955 or 0956 is up depending which key is used. No buttons pressed from the remote part during the off-on.

The car starts / runs ok, only other VCDS seen problem with CCU was de-safe with passenger door that pops sometimes (and that LHD drivers door sometimes doesn't unlock which might be the same thing?). Also some other code but I think it's webasto releated.
So is the CCU going going guano or can I take it to dealership for actual repair as I don't think the new key introduction with VCDS would help here or?

Thanks for thoughts.

 

[dadomonster]

Seems like it's the notorious CCU thats given out. Can't code it with VCDS (chan 21) to accept keys.
Also posts http://www.vwaudiforum.co.uk/forum/showthread.php?105568-Key-fob-not-working-the-remote and http://forums.audiworld.com/showthread.php?t=2558215 say the same thing, even though being for different cars.

My box is AC ending, 2 electric windows. And I checked the threads about CCU here and a2freunde-wiki:
http://www.a2oc.net/forum/showthread.php?20410
Googletranslated wiki link

So I am safe looking of AC or AF ending used unit, but how do I check the "PR-5D1" code for the unit that is the only choice with remote locking? I am ok without the remote so I think I'll source a used box first, seems around 100-150euros and then get the old box repaired ~100euros? Atleast I didn't find any other "system" on the car that might be affected due the CCU problem in hand.