I Checked the Freezer Damper and it moves fine also pulled the back pannel off the freezer to check the frost pattern and it was even top to bottom.
I double checked the entry of the sensor bulb into the tube shield and it was all the way to the bottom.
The refrigerator still cools to 21f and freezer to -15f set on 1 on the control.
I tried without the sensor tube cover and made no difference. It runs fine at times Ref. 32f-40f but then for no reason it goes out of control.
We decided rather than call a Service Tech.we will replace the Refrigerator for a New One that is more efficiant as the door seals are also getting bad and it is 13 years old.
Thank you all for trying to help. Eugene