I searched YouTube and found several videos that helped me diagnose the most probable cause. I learned how to open the cabinet and access the parts from the videos. I ordered a new discharge hose and a replacement pump. The parts came in the next day with the standard shipping option! It turned out that the old discharge hose was blocked. I decided to replace the pump also since I had the machine open and the new pump was only $22. It's amazing what you can learn online!