Haven't done this yet.

Was half thinking about planning a trip that included a stop at the LS factory but have not even confirmed that they would do this.
My LS makes a low thud noise when the rear is rocking like the valves are opening or closing. Doesn't sound like any kind of failure but it is definitely there.
I talked to Chad at LS and he said there was a design change that might correct this though it was not considered a defect.
Wanted to have them listen to it and see if it was worth fixing.
It is only noticeable at low speeds when cornering.
Have you heard such a noise?