[Elecraft] MH2 Microphone issue

[KA1YMX]

The 5v regulator U5 on the control board has an output of 3.0v. I
disconnected the front panel from the control panel and the output is still
around 3.0v. Do you think the lower voltage could affect the operation of
the microphone?

I also noticed there is an update to grounding the microphone jack. Could
the lack of ground some how cause this?
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