I used the diagrams on appliancepartspros.com to identify the part at the location of the leak, which turned out to be the diverter motor. I watched the video on the product page that describes that part. Based on the video it seemed like a repair that I could do myself, so I ordered the part. Several days later the part arrived and my son and I were able to perform the same steps described in the video and, voila, the leak is gone! My dishwasher is slightly different than the one in the video but close enough that the steps were pretty much the same. The repair took us about an hour, but saved me hundreds of dollars.