I have a Kenmore dishwasher 587-14153402 that is about 4 years old. For a long time now, our dishwasher will get stalled and run endlessly if I select a High Temp Rinse. I don't think it has anything to do with the water not being hot enough because I can choose a High Temp Wash and it works fine. So if I choose the High Temp Rinse it will run for hours and hours and hours. My guess is that it is a thermostat problem? I can't find any detailed repair manuals which would point me to which thermostat it might be or how to replace it. Any thoughts?