Silverball,  have you

1. Taken the machines back to the Stern dealer you bought the machines from in the first place ?
2. What specifically are the issues you are having ?
3. Have u contacted AMD or the Stern dealer in Australia, and what did they say about all of this ?
4. Have Stern in the USA referred u back to the Australian Stern representative ?

If it was me, firstly,  I would take the machines back to the Stern dealer I bought them from.
Secondly, I wouldnt attempt to fix anything, it might void the warranty.
Thirdly, If I was going to tell others on a forum that I was having issues,  I would tell the other members of the issues you are having so that they may learn something from the experience and it may help others when they get their LE machines.

I appreciate you highlighted my post, and mentioned the 18 grand u have spent, but we are all still in the dark as to what is really going on.
Did u  buy the machines from a Australian Stern dealer ? I only mention that, because any ACDC machines purchased that are not Australian delivered have no warranty in this country.

It would be nice to know the full story. I hope it works out for you.