Hi @stevejarman
Couldn't find a video but here's the [https://www.partshopdirect.co.uk/makita-dgd800-cordless-18v-lxt-die-grinder-spare-parts-s18461/|parts list] that may help as it has an exploded view of how the parts are assembled in the drill.
Looking at the list there are 3 bearings - part #8, #12 and #34.
If you scroll down you'll find the Makita part numbers for the parts. Search online for the part number to find suppliers that suit you best