Must say, Thank You, to both for your valuable input, 'Knowledge is power" as they say.

I will consult with my MB parts dept' on Monday. My customers parting comment on Friday was...." ...will it be another 4 to 5 thousand dollars or so Don?..."
My reply was ....'Shouldn't be"

With this in mind, I think I might replace Temp/Pressure switches and also the Temp' probe in the Evap' housing and follow this with the re-programming with the Push button Unit

Will try to remember to update this post with the 'FIX'

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"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."