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I've got the same problem but I think mine is the wiring under the truck. I would check that before tearing into the dash. My .02. That being said I am no help with the dash. Never been in there
only 2 screws that hold it in place, they are behind the 2 rectanguler darker pieces that you just pry out. the rest just clips into place. Former owner of my truck just ripped everything out w/o removing the screws.