Merlin, I suggest getting back to basics, so to speak. Make no assumptions.
Check the nameplate specs on the machine. If it's configurable for multiple voltages, check the actual connections; don't assume the "default" to be accurate; it may have been changed.
Check your actual supply voltages, including while under additional load (lighting, air conditioning, etc.), and recheck for little or no voltage between neutral and ground at the machine, while running.
Also check for proper grounding under load. In other words, use a tester that places a bit of current on the grounding path, such as a solenoid tester or a light bulb, and not a high-impedance voltmeter.
Lastly, see if you can get more info from the maker as to the past damage. Is it always the same? What is their diagnosis? Overvoltage? Static damage? Ask for suggestions from them; a tech support dept?
Good luck, and let us know what happens.
