Hi, I have a Bosch KGS3700 Duotronic fridge/freezer, ( has 2 compressors and 2 thermostats.), its 21 yrs old. I'm just asking if anyone could advise: - Its been running fine since 1991, one repair to replace a thermostat. However, over the last couple of years, it seems to be running most of the time, ( either the fridge, or the freezer.) Most times I walk in the kitchen I hear it, though it does turn off at intervals. It doesn't seem overly cold, just normal temperatures. I just think it might be costing more to run these days than it used to. I was thinking of replacing it. Grateful for any suggestions/advice.