We have just come back from Dargo and have had the same problem. We have a cargo barrier on ours so we were up the creek a bit on this one. The worst thing was the nappies for our 1 year old were in the back. :o. We got a yakka stick to pull the inside lever but it didn't free it either. I tried lifting it up, down, in out all with no avail. My wife then comes along and has a go, I say "It's no good I just tried............ Oh never mind,........... well done" !!
This is the result from dust. Bloody Land rover club was camping in Dargo and a quick trip to Talbotville resulted in dust, dust and bloody more dust. I now realise the seal on the back door isn't the greatest! I borrowed some CRC from a RED 130 camping nearby and flooded the lock whilst manually operating it with a screwdriver, (It was actually a hammer but a screwdriver sounds more sensible), It has freed the lock up tremendously but still seems to bind a bit. The trip home on the high plains rd is all dirt but we were able to get the door opened once we got home, so as far as I'm concerned this problem is ticked off the list.

