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Thanks to all who have posted and shown the way to this repair. It was very simple due to the knowledge gained here. I had previously tried the wd40 trick and it worked for six months before it finally died. After replacement I took a good look at it and then took the motor apart. The motor sits so that the weight of the fan is on the backing plate. This eventually wears. My fan was touching the plastic of the motor housing. The bearing on the fan end looked rusty. To my surprise the bearing on the other end was at least as bad if not worse. I do not believe that water is getting into the unit. Temprature changes and condensation are most likely bigger issues. I can not recommend the wd40 trick as it will not give more space between the fan and motor housing nor will you be able to oil the bearing on the motor end. Oiling may keep it going for a few days but if it is acting up just get a new one. 15 minutes and the job is done.
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