Hmmm... looking at the unit I got, I'd do the following:
* Check the bolts on the transformer, might need some tightening
* Use a DMM to check if all exposed metal parts are connected to the earth-pin on the plug (safety first)
* Remove some of the paint on the back side of the front-panel for better earth connection to body
And just to be on the safe side, compare the board revision. I doubt they have changed things, but you never know.
If you want the cpu adapter board, I have one left. You'd still need some parts though (2x IC socket with machined pins, pin header, caps). The board is 3.50€ incl. shipping in DE.