transmission question: how to check/replace bearings?

[nep]

i was pulling apart my trans to replace some gaskets and noticed what look like pieces of a ball bearing. you can see the shards in the picture below. i am in the middle of a swap so i dont know if the trans made noises. the bearings themselves seem to roll smoothly. should i replace them? how would i go about doing that?
http://upshizzle.com/pfiles/5566/IMAGE_00061.jpg
http://upshizzle.com/pfiles/5564/IMAGE_00062.jpg
http://upshizzle.com/pfiles/5565/IMAGE_00064.jpg