hello: i purchased an old (15+ years old) sub zero 351 and it has been working great until a few weeks ago it started occasionally making a small noise. now, it makes a horrible loud noise that lasts about 20 seconds and occurs about every 2-3 hours. it sounds like a buzzer alarm going off -- a very harsh, hard scary sound. it almost sounds more like it is coming from under the unit than above it, but i really can't tell. the fridge and freezer both are still cold. any ideas? thanks for the help! --marie
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