Check here: Replacement LED High Mounted Cadillac Third Brake Light, Brakelight, Third Brake Lights, For Cadillac Escalade ESV, Escalade EXT, Avalanche LTZ, Chrysler Crossfire, Lexus SC, 2010-2011 SAAB 9-5, 2015-2019 GMC Yukon Denali Tail Lamps

IIRC it is about $150.

There is an auction for repair as well on ebay. https://www.ebay.com/itm/Chrysler-Cr...dZ6dRC&vxp=mtr

The LEDs are not the trouble, its the board they are mounted on.