OK, I have taken the unit out to better look at what can be done to either replace it or oil the two bearings. I decided to put the oil to the two bearings using 20 wt. non-detergent, about 3 drops. Put it back in, only 6 screws hold it in, and try it out.
The howling has quit, I will see how long this lasts. I can see buying a new part eventually, but will see how long the oiled unit lasts.