Cleaned the condensor coils? If not locate the coils either underneath (open both doors and remove the toe kick) or in the rear (remove the back panel). Use a vaccum or long brush to get any dust, hair or debris off these coils. These coils are allowing the refrigerant to cool down and if hair or dust is all over them they cant release the heat efficently. This kind of stuff will insulate the coils and the heat cant escape or release. Otherwise you are dealing with a freon issue. If the unit is running but not cooling correctly anylonger it probably has lost some freon and will continue to lose it. Hopefully this helps.