Good luck finding someone to replace the bearing. That is not something that can be done in the field. So paying someone to remove the motor, take it to a shop, replace the bearings, installing the motor may be greater then installing a new motor. Get some quotes before you start down a path.
Sorry one more question
Is there a way to see if perhaps the ventilation fan at the back is the cause of the noise?
I removed the fig plant and got closer to the motor and notices the noise from the back of the unit , thinking of popping open the vent fan