Hey alien, The Dewalt 788 requires no maintenance. All the bearings are sealed and lubed for life. I have only heard of one bearing that has failed.
My regular maintenance is keeping the table waxed, and brushing the area around the switch to keep it running smooth. The switch is problematic because sawdust tends to get into it and causes it to stop working. Compressed air usually takes care of that.
If the motor stops working, the brushes will have to be replaced, but in all the years I have had DeWalt saw I have never had to do it!