I have just purchased a new (to me) 2014 E350 Cabriolet that I ; however, although it performs beautifully, when I took it to a transmission shop to ensure my fluids were all good and didn’t need to be flushed or added, they told me that my vehicle had SEVERAL serious codes popping up when they checked. They tried clearing the codes and checking again, but each time the codes reappeared even though there are no lights on the dash of warnings AND even though it is driving perfectly. PLEASE HELP!!!