why is the refrigerator making a gurgling/tapping noise?

Hello
Is the unit operating at normal temperatures ? It should be -5 degrees to +5 degrees in freezer and 38-44 degrees in refrigerator section. If temperatures are good run unit through diagnostics see link below. If temperatures and diagnostics are normal you have a metering device making noise. We have have several units with the same issue, refrigerant moving through the system causing this noise. Factory says its normal functioning noise. Matt Ace technician