I think its a great idea to remove the surfaces to inspect the bearings as well as the structure that is not visible with the surfaces installed during a "heavy" conditional check. At that point you can closely inspect the bearing for any signs of play, rust, pitting etc. If they look good and operate freely I would lube them up good and continue them in service. The bearing will last a very long time especially if they are well cared for (lubed often, I use Triflow or LPS2).