Right, replacing the bearings is the easy answer.
The reason I question it is not because I,m cheap. This if for my K0 bike. It sees maximum 500 miles a year, usually less.
Also they are original bearings, and as I said they feel really smooth still. The hub looks the same as the day it left the factory, perfect.
If I replace the bearings that will not be the case anymore.
I would really just like to get a little new grease in there. Or maybe I will just leave it alone.