If it's the TSB then just tell them that that's what you think it is.
If it's the separate issue with the sway bar end links, tell them it sounds like metal on metal clanking and it only happens when there is twisting (swaying, hence related to the sway bar) involved. If they're loose enough, you can open a door, grab the sill and rock the truck back and forth and if someone is looking at one of the end links, you can make the connection between the clank and the sway bar and end link hitting together.