Hi Mark and thank you again.
I sincerely hope GM technical assist are singing your praises as it does make life easier when we can present evidence of audible noise.
Noises must be one of the most difficult phenomena to describe as there are no industry standard descriptions of what a knock, creak, squeak, thump, flutter, buzz or thud actually sound like.
Taking a recording and presenting a visual representation of what you could actually hear is undeniable evidence there is a real problem.
Whilst this was a failed spot weld resulting in a creak, it does not bear thinking about what fault/failure we could have seen had this been ignored, 5 years from now!
The knowledge of what components were not responsible for the noise proves invaluable and allowed for an informed diagnosis of the support frame based on the test results.
I said it before and will say it again, nice work and thank you for posting the results.
No need to search for the psdata files