I have an MX170 radio that I use to pick up ATIS, etc. Recently it
will occassionally have a buzz in it that is so loud you cannot hear
the transmission. It will buzz on all freq, then later in the flight
it will go away. This unit is no longer supported so I'm wondering if
there is any chance this could be something that could be addressed
without opening the unit (which is now illegal to do ).

-Robert