Being technically challenged, if I can get help from one if the younger guy at work I'll try to do this.
Regarding my lighting upgrade, continually calling GM customer service and expressing my dissatisfaction with my Sierra's headlights led to them assigning a case number (case number is on my work order). Quite a few months later I was provided an email address for someone at the top.
I took a shot at sending a nice polite short story on our headlights. Say a week passed and no response, then one day at work I received a call from GM Executive Office offering to send my dealership a pair of bulbs and BCM reflash, of course I accepted there offer. This was a first for the dealership they had never done or heard of this before.
Result is a great improvement over the previous lighting! I originally thought no one really cared, I was wrong--glad GM steppd up to the plate.