Deduced that the cause was a failed bearing for the drum. Ordered spin bearings (both inner and outer). Although APP did not have a video showing bearing replacement, they did have a video on tub seal replacement that was adequate to get most of the way to bearing replacement.
Did have an appliance repair company come out and assess the situation. They suggested replacing the entire drum, at a cost of $1500. Replacement parts purchased from APP were less than $200. Of course, the repair took several hours of personal time, but the repair went without issue, using the APP videos.