10 years is a significant run time for a fan motor. You could try lubricating the bearings but it may only provide temporary abatement of the noise, if any. It's unlikely that bearings are replaceable, and even less likely that you'd be able to find them.

You might have better luck trying to replace the entire fan.

On Tuesday, February 20, 2018 at 8:53:55 AM UTC-6, FreeMan wrote:
Electronics are OK but the fan is super noisy on both my units.
Took it to the local Oreck dealer and they said no can fix.
These have the buttons on the top and have a silver removable cover to
access the filter.

But can it be fixed ? Bearings available ?

Amazon has new but it will not let me make a purchase based on my
location (Southern California). Why ?

I have used the two I have for over 10 years but now cannot stand the noise.