Getting my TOB replaced!

Dropping my truck off tonight to be fixed tomorrow for my squeaky TOB. I've been to 3 dealerships trying to get it fixed and finally found one that would do it and not give me excuses. At first, i showed up and they said the TOB TSB was not covered under my powertrain warranty and told me basically that i would be paying for it. Called Toyota's 800 # and talked to them for 45 min and went back to the dealership with a ref # from my case, and told the dealer that it is covered. They reluctantly agreed to do it under warranty (it even says in the TSB that it's covered under powertrain). Glad this will finally be over and i will have no more loud chirping under my truck.

Truck has 75k on it now and TOB has been getting louder everyday...hopefully this is a permanent fix.

Do they change the trans fluid when they replace the TOB?