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The best way to do this is by checking your superheated at the compressor.
Depending on how far the compressor is from the case or box, the condition of the insulation on the suction line and were...

Grease bearings.
Loosen up the tension on the belt.
If this fails then you only have 2 things left.
Esther te compressor is starting to get tired or you need a new motor

Replace the t-stat
And make sure that you get oem case parts