It was Christmas Eve several years ago. Everything was ready. Our overnight company would be arriving in a matter of hours. I opened the refrigerator to discover the inside had reached a balmy 70 degrees Fahrenheit. This could not have happened at a worse time. Away to my computer I flew like a flash, straight to RepairClinic.com, where I entered the make and model of our refrigerator and read all the possibilities for why it was running, but not cooling. By following the suggestions and detailed instructions, we performed eight years’ worth of maintenance by looking under the darned thing for the coils that had become hopelessly covered in refrigerator gunk. We were back up and cooling in no time at all. One thing I learned from my holiday refrigerator meltdown is that, like cars, major appliances require routine maintenance to keep them working at the peak of efficiency and …