Not getting cold

We just inherited this nice looking fridge but it will not get cold. I plugged it in yesterday and it got cool but today it is back to ambient temperature. I was told the Temperature control was bad and in reading some of your threads it seems the freezer control is the culprit. I removed the screws but the control panel does not want to "let go". I see in the picture it appears to have a couple of pegs from the side cover to the back of the control panel.
Do you have any advise on the removal and am I going down the right road?
Thank You
Edsel