Subzero refrigerators in St Andrews, Polo Club, Woodfield CC and Broken Sound were installed by the builders. They are state of the art and built like tanks. But, they all need a 20-year servicing. They need a degreasing, chemical clean and de-molding! All cabinet seals need to be repacked and all mildew must be removed and sanitized! If you see mold in your refrigerator section, you needed this repair and servicing along time ago. Just because its cold, does not mean it is working efficiently and most of all it does not mean it is a healthy refrigeration system. Your Sub-Zero Refrigerator is built like a commercial food storage system. It has a cold plate inside that is always wet and in darkness. When air leaks in, this happens when old seals that tubing and wiring go thru the cabinet. The hot air on top mixes with cold air inside and creates mold.