I'm almost on the same boat. There are motor rebuilders, but a NOS might be cheaper.
My motor is making noises. At some point I will remove it and see about rebuilding it myself. As long as the shaft surfaces are clean you can get bushings, ( might have to machine the ID and or OD) and brushed.
I bet if you use some penitrating oil and time you can get it freeded up. If you find a replacement and want to get rid of your frozen up one I'll take it!
