Buckshot,
The bearings are not sealed bearings but yes they are sealed in the housing. The fork assembly must be blown apart, bearings removed, cleaned, checked, and repacked then reassembled. The suggested service interval is 25k. It is not difficult to do this but it is labor intensive. I suppose it is possible to drill and serk if a person wants to. Think of all the $$$$ the Dealers will make doing this operation. Imagine the all the $$$$$ the MOCO made by eliminating one serk
Blues