There's a technical sheet in the Gallery
On page 2 it seems that the cups slide off the axle, cassette bearings press fitted onto the axle. Nothing too weird.
The bearings themselves are given Mavic part numbers, but are 16x30x9mm apparently, not standard 6902 (15x28x7mm) or 6903 (30x17x7mm).
SKF number SKF part # BB1-3507: (stolen pic from Flickr)
A quick look on the SKF Bearing finder
ironically found nothing...doesn't look good for replacements
I've got the BB cutter if you need
All the best,
Pause, take a breath and ask yourself: "What would Rastamouse