Replaced the sump and one clamp. The video advice was excellent, along with the other stories here. It gave me confidence I was on the right path. Like many others, the seal on the diverter motor shaft was not sealing anymore. Upon removal of the sump, and comparison to the new part, the shaft seal hole had clearly enlarged. The actual diverter motor was fine and didn't need replacement.
The advice about using a new clamp was essential. I got two just in case and ended up returning the unused one. AppliancePartsPros.com made the return really easy. Rest easy if you do this return, you only need one clamp.
If you take your time and follow the video, the job isn't horrible, but it isn't as trivial as some other repairs. In my case, the hardest part was dealing with the hard-wired electric, and the hard-tubing water connection as is typical of an older house. The appliance repair part was the easy part.