X164 GL-Class
So it looks like the dealer installed a Genuine but REMANUFACTURED radio Parts SKU: 164-900-73-01-80 aka 164 900 73 01 80 aka 164.900.73.02.80
It started going crazy a year after install and they pretty much said if you want us to check it pay a re-diagnostic fee of 300$ to which I said I have...