First and foremost, I'm looking for the entire TSB for a Chevy Colorado. Specifically, this was for the 2004-06 cylinder head issues that triggered the P0300 CEL. I am willing to compensate financially if it costs you to get it, please PM me first.
Second, I have a few questions on warranty work in general. In my case, a GM dealer diagnosed the issue and confirmed it as meeting the parameters for warranty replacement. Several weeks later, another employee of the same dealer refused to do the work without being paid in full prior. Can they do this? This was a GM product.