My right had drive Model 3 squeaks when the car is on an uneven road or any situation that causes the chassis to flex. Annoying when you are on the phone with no other sound. The only way to stop the squeak is to undo the wide or 60 side of the 60/40 rear seat and leave it forward. You then trade the squeak for a bit of road noise. On my visit to Service it is hard to replicate as the road is flat. Service says it could be something to do with the rear parcel shelf. I have tried foam in between the seat and the lock. Lubricating the lock. Any other suggestions?