WileE, lots more than 16 have posted this issue on this (and the other) site 'as the problems occured'. They may not all be regular readers/contributors.
Maybe Kelly J could wade thru the old posts and dig up this information.
(I'm sort of betting that GM already has and that the result is one of the reasons they have assigned someone to help us get the dealers to correctly diagnose).
Kelly we thank you for your efforts.
2018 GMC 2500 L5P CCSB 4x4 Denali - Mineral Metallic; previous '11 LML, '10 LMM and 04.5 LLY