The input gain and bass controls stopped working. Rotating them to adjust the speaker toggles the sound on and off. Sometimes it doesn't even work until you set the input gain control properly. About 1/2 way up. All connections from the system have been double checked and verified correctly. The block was installed under the chase in my boat that never gets a drop of water. Only used 2 trips. Now the buttons don't work and the speaker makes an intermediate tone.
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