Thank you guys! I've looked on youtube and haven't found any video about D2 repair yet.
There is a Rainbow website I could buy replacement parts from, and I can chat with representatives there too. THey may explain how to change the bearings or send me written instructions with pictures, I don't know, I will ask them.
I'd really like to use this machine on a regular basis on the main floor of my house (no stairs). I like the idea of the water reservoir being used as a filter.