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I'm measuring 2.4V between GND and 3.3V when i put my power adapter on 3.3V, and 2.7V when i put it on 5V, and I'm measuring 2.5V between GND and V of the power adapter when the MDBT42Q is disconnected, and 6.7V when it's on 5V with the MDBT42Q disconnected. I have a 9V 1.2A power supply connected to the power adapter.
The lights are also off when powering it up with the button held down.
OmegaRogue
Do you think you could check the voltage between GND and 3.3v on the MDBT42 breakout's pins with a volt meter? That'd help to narrow down if it's the voltage regulator on the module that is blown, or something else.
Also, did you try just powering it up with the button held down to see if any lights light up?