There pretty much are: "no user serviceable parts inside"
But.....there is a connector supplying power to the logic board in front, and data from the logic board to the volume/input selection relays in back. if you decide to take the top off you could have a look to be sure that connector is firmly seated.
Typical logic problems of any kind, whether caused by static electricity or other, in my experience have always been cured by the re-boot.
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