Chris.. I have now had our 19/19 U24MB to three separate Mercedes dealers without a fix for our cruise control issue. I see below (message #18) that Widman has the same issue and Fairfield was NOT able to fix it. Widman now has an appointment (message #20) with Mercedes of Santa Rosa for the repair. do you have any information on your invoice/paperwork that would provide the software update that corrected your cruise control issue?This sounds similar to an issue I had when I picked up my 2019/2019 CB from Sacramento the other month, almost certainly before you. I had a message saying "Active Brake Assist disabled" or something like that.
I took it to MB of Fairfield and they updated the software. All fine now and 2,500 miles in.