There is somebody on ebay that sells motor bearings for a Rainbow SE, and they include a diagram schematic of all the Rainbow motor parts

Wow, that motor is one of the most complex in a vacuum and to repair it can be very difficult, if you want to replace it you can but it will be very expensive just for the part. the screws are hidden under that big rubber gasket on the bottom of the machine where the water tank sits. you should also replace that gasket two because it will get ruined when you tear it off.