2000 Denali squeak in dash

I own a 2000 denali that has an annoying squeak somewhere. It seems to come from in the dash. I have taken off the dash front and glove box to find it with no luck.

Hi, did you take off the dash cover?
It is easy to do.
There are a few screws, the windshield pillar covers are held by metal clips and pull off, the passenger grip bar over the glove box pulls straight out. It has a pin at each end that has some release mechanism that you squeeze or twist, I don't remember which.
Take care, Eggert :bananasmi