Here are the additional comments from the TSB -
Equipped with RADIO-INFOTAINMENT SYSTEM - UPLEVEL HMI, ENHANCED CONNECTIVITY and RADIO-INFOTAINMENT SYSTEM - UPLEVEL HMI, ENHANCED CONNECTIVITY, EMBEDDED NAVIGATION (RPOs IO5, IO6) WITHOUT RPO U42
If I read this correctly it looks like it applies to vehicles "without RPO U42" which is the RSE - not sure why that option would preclude a fix for the rear camera brightness but it seems as if dealer was correct.
Equipped with RADIO-INFOTAINMENT SYSTEM - UPLEVEL HMI, ENHANCED CONNECTIVITY and RADIO-INFOTAINMENT SYSTEM - UPLEVEL HMI, ENHANCED CONNECTIVITY, EMBEDDED NAVIGATION (RPOs IO5, IO6) WITHOUT RPO U42
If I read this correctly it looks like it applies to vehicles "without RPO U42" which is the RSE - not sure why that option would preclude a fix for the rear camera brightness but it seems as if dealer was correct.