Fanuc Alpha i 20,000rpm Spindle motor bearings ?

Hi Folks,
Our Fanuc alpha i 8/20000 spindle motor (A06B-1497-B145) (superceeded by A06B-1497-B901) about 10 years old, is electrically 100% ok but has developed lots of play at the spindle coupling end and we would like to strip it and replace the bearings.
Fanuc and the machine tool co. will happlily do us a service exchange motor, but this is a fixed cost of mega bucks.

We wouldn't normally be too worried about carrying this out ourselves, but on doing some digging online there seems to be lots of mentions of Fanuc using custom bearings, which Fanuc don't sell and can't be readily crossed referenced from a bearing supplier.

Obviously the normal plan would be change like-for-like with premium high speed quality units, but my read up of custom bearings has casted doubt on if this is practically possible.
Would like to be prepared prior to getting spanners out and stripping motor

Has anyone had any experiences of changing these bearings out or where to get them?

Cheers

the bearings has ceramic balls and are very fragile.
this change is a challenge to be done with rudimentary tools
you can easily brake a bearing during mounting
only thing u can do is to put normal bearing P4 only for 12,000 rpm
if you still want 20000 i suggest to look for a company like SKF or buy the new Fanuc motor .
if you are not dismounting the motor ,you can get discount from Fanuc to give back the old one.
just my 2 cents on this.

Speak to James at CNC Centre if you pm me I'll give you his number they are all ex 600 Centre service guys so will be able to tell you exactly