you don't get your repaired they just send you someone else's they have! so you could send your immaculate condition and get one that been flushed down the bog! but the new ones all have slighlty different designs so the problems with the rings of death should be less. Most of problem is people haven't focused enough on keeping the powerbrick nice and cool by throwing it behind the tv with all the other wires! try to keep it on a hard surface where it can "breathe"^^^
You can get them repaired / replaced for free...