I have picked up the KJ and all seems back to normal. After I had a chance to talk to the mechanic I appreciate the scale of the job they had to do - they had to drop the transmisison slightly to get this thing out (talk about great design work - not engineered for easy maintenance). I am attaching a photo of the faulty EGR pipe so everyone knows what it looks like and where it will fail. Sorry for the photo quality but it was taken on my phone and they would not let me keep the pipe to photo it properly. There are comments put on in red so that you can tell what is what. They had to cut the EGR valve end piece off for some reason to get the thing out. It is clear from its position on the back of the engine that it would never be field repairable, which begs the question 'What do you do if it breaks on a corrugated track somewhere west of Whoop Whoop?'.
I was told by the service manager that the 'new' pipe is made much better than the original one. The originals had a couple of shallow spot welds on the end where it clamped to the exhaust manifold, where as the new ones have a complete thick ring welded flange on that end. The obvious question is why don't they recall these things, but I guess the amount of work required to change one sort of explains that. It won't be a problem for my son's jk CRD because they use the 'new' pipes. I do wonder when they changed over. As my KJ was one of the last built I suspect that all the KJ CRDs running around in Australia (that have not already had this fixed) will have the problem at some point.
For your information here are the part numbers for the new pipe and the new clamp used to fix this up:
Pipe EGR to Manifold CHK68020537AA
Clamp, Int. Pipe CHK05142994AA