For anyone interested, here is the response I got from Steve:

“It's an artifact of your circuit tester when plugged into an isolation transformer. The ground is not actually open at all. If you use a VOM to test it you will see everything is properly grounded.

Steve Deckert  DECWARE / High Fidelity Engineering”


I’ll haul out my multimeter this weekend to check things over, but based on Steve’s feedback everything should be good.