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@Gordon
It might be the voltage regulator on the power supply board has blown up then?
You say you get 3.3v correctly - you mean you get 3.3v on the MDBT42 breakout's 3.3v wire as well?
If it's not working now, I'm afraid it may well be blown up. If the power supply board wasn't meant for AC, and was outputting negative 9v straight into the MDBT42 breakout, there's no way it's meant to survive that kind of punishment.