Balfour will work on it for life - sizing, etc. Not sure about dings and scratches, but you can call the association ring office for more information. The dark finish wore off mine in what I thought was to short of a time - sent it in and it came back looking like new, but it was mine because I recognized the scratch it had on the inside. Then we installed a stone when I got married and I used Dennis for that along with assorted dings, burrs, and sizing.
With the Association you may or may not get your own ring back if there are major issues with it. They will send a brand new one.
If someone else works on it, they will void the warranty.

Gig 'em Aggies!