Probably the condenser coil (the one by the compressor ) is dirty , even if doesn't look dirty ,if the unit is located inside the kitchen always grease gets in the coil , go to a refrigeration store and get a condensing coil cleaner , unplugged the unit , spray the cleaner and rinse it with water (is better with a hose , try not to spray water to the electrical parts or wires).
Here is a tip that I wrote about how to add refrigerant to a air conditioner or cooling system
How to add Freon to a Air Conditioner or Refrigeration System
heatman101
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