Transmission Rattle Noise - TSB 04-13-4

Ok - I know I saw info on this before, but couldn't locate it. I noticed some "gumball machine" type rattling that's coming from the tranny. I tracked down a tech service bulletin and followed it up with visit to the dealership. They say the problem is a cracked or broken release bearing guide tube and the fix is to install a "revised adapter cover plate which contains a new release bearing guide tube". Anybody have any experience with this??? Makes me nervous allowing folks to tear into a tranny with only 2700 miles on it. (Also have some driveline vibration that feels a bit like a u-joint going, but could also be the rearend... I've gotten on it a few times pretty good, but now I'm beginning to feel like my Cobra is a bit more fragile than anticipated.) Holy Crap - sorry for the book! (Any advice Uncle Meat?)

Thanks for the feedback. They're picking it up on Wed and plan to have it for two days. If you come across the TSB let me know. By the way all - Getting my Borla Catback in a few days - WOOHOO!!