You will now need to tap into the Sealed System if you have not already to read your High and Low Pressures. Please be sure to record your Run pressures. For proper diagnosis you will need both the High and Low side pressures. Once you have your run pressures recorded you can continue to below question:
Unplug Unit, Do Pressures Equalize in 5-10 Minutes or Less ?
Keep In Mind...
If you have a Dual Evaporator unit that is restricted in the capillary tube to one evaporator only then the pressures will still equalize. If the issue you are facing is the Freezer is cooling fine and the Refrigerator is not or vice versa then the issue will be a Restriction on the side that is not cooling.