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is the noise comming from inside the refrigerator or from the compressor in back ?
Sorry, I'm afraid I gave the model information for the dish drawer below the fridge! The fridge model is a Subzero UC-24CI.
The noise is coming from the vent area directly beneath the freezer - a loud hum every 15 seconds. As I mentioned, we had the fridge serviced end of June, after the unit wasn't powering on. It is cold now, but the motor sounds labored.
It is impossible for me to look behind the unit as it wedged quite tightly into cabinetry. (Last time it was serviced, I had to have someone first come remove the unit from the wall before the mechanic could do his repair.) I can tell you something else:
When I open the unit, the noise temporarily stops. However, when I push in the little button at the bottom that turns the light off, the noise starts. Let go, the noise stops; depress the button and the noise immediately starts up again.