I am not a fridge expert by any stretch, but is the noise coming from the compressor area or the freezer area? Might also be a condenser fan problem (usually mounted near the compressor). Either condenser or evaporator fan blade may have come loose or maybe a blade is clipping/touching something now as it turns? Bearing in a fan....but in a 2017 coach you would not think so. I think all three items run at the same time in residential fridges.
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