Good job troubleshooting. I had an issue with the same radio. No volume from any channel. I just took the radio to the dealer after calling them. I dropped it off mans received a call a few days later that Keystone authorized replacing the radio and they did just that. Hopefully your dealer will do the same. You are saving them time and effort by bringing in just the faulty radio.
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Tom
2019 Alpine 3651RL
2016 F350 CC DRW
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