There’s tons of TSBs for any make and model out there, sometimes hundreds. As someone else said, it’s just a guide as to how to diagnose and repair common problems to a certain model. They create a TSB because it’s common enough to do so, but it doesn’t mean it happens to all, half, or any significant number of the vehicles.
They wouldn’t have helped you out (or covered it for that matter) when you were in warranty unless you had the actual problem and they could verify it. They may be telling you that now to sound good, but they wouldn’t have.
When I got into a long drawn out front end rattle diagnosis with Mazda, they quit paying the shop diagnosis time because they weren’t fixing the problem. Then the shop refused to even drive or check for my noise anymore even though I was still in basic warranty. I got corporate involved, sent videos of the noise, got further diagnosis time approved for the dealer, and STILL got nowhere with getting it repaired. They fell back on “we’re a boutique brand and don’t have the funds to chase down this isolated issue with your car, or to throw parts at it and hope we get it right…we’ve already tried a few things and fixed one noise, your car is safe, we’re at the end of the road”. This is for an actual problem they could hear and experience, they just couldn’t figure out how to fix.
