Thanks for your feedback albeit you have made a leap & conclusion that is off base. The part number was listed on the 5th gen fix PDF. I took the car to a Mercedes dealership. They told me I needed to buy the entire assembly but they did not have anyone in house that could recode computer. The part number listed on the fix is not available in Canada until Jan 2020. Given you are in Caledon I am sure you already know how easily parts are to come by?
I took it back to my own mechanic who had serviced my car but he’s admitted he has no experience with this problem. Not sure how much more honest you’d like him to be? I also have no experience. In 19 yrs this is the first mechanical failure I have had to deal with.

I am new here and; I am putting in all my effort in an endeavour to get the best advice & solutions from the very people I think this forum was created for.

I decided to come to the experts. There is more knowledge in this forum than either the Mercedes or Chrysler dealerships combined seem to have. I appreciate and am grateful for all of the support and education I have been given today. Thanks for your input, it’s been really welcoming.