When to change 8 3/4 bearings

This will be the first time i deal with the roller bearings (stock).
I have aquired a 8 3/4 housing with axles and I believe that stock bearings are still on there.

The bearings rollers are good, no rust. The bearing collar, the one that cradles the rollers has its light brown spots but no rust and the collar that keeps it all there is grooved or scorned.

They seem quiet at hand turning speed, Do i just clean and repack or what am I looking for to see if they need to be replaced?

The top collar is all scratched but its just the collar is this ok. Housing is fine.

Thanks
Steve