Rear axle bearing access is remove the C-clips and pull the axles out.
Now, you can use a sliding hammer puller and pull out the bearing and seal together.
You use SAE 90 wt lube on the outer surface of the outer race aiding in the bearing install into the tube.
Seal is next and sealant on the outside of the seal shell may not be a bad idea. Install squarely.
The axle is the inner race, you will see where the bearing rides on the axle.
The surface should not pitted, grooved, or missing any part of the surface, and the bearing surface should not be grooved deeply either.
A new axle may be warrantied.
Before installing the axle, spread a finger full of gear lube onto the bearing rollers.