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I had the same problem and wound up returning 2 units to West Marine (no questions asked on the returns). I only returned the unit the first time, after the second I removed the transducer and had the same issues with the bubbles. The directions for Hummingbird say to use ONLY 2 part epoxy and not Goop, silicone or 5 minute epoxy because of the possibility of bubbles forming over time. I should have read the directions from the beginning.
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