Replaced the seal and the push-on nut. I was ready to replace the entire motor & pump assembly when I found the video you have on your site showing that the seal is replaceable & how to replace it. I followed the removal of the push-on nut ( by cutting it) and seal as described, but the install of the new seal per the enclosed instructions is a little confusing, and what took the most time is that new push-on nut is VERY tight making it hard to push down into it's groove (if I had to do it again I would try an E clip instead).
After all that the machine is leak free.