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I had another thought that could contribute to high head pressure and elevated temps. I noticed that you changed your condenser fan motor. If you put the fan blade on backwards when you reassembled it, it would not move sufficient air to cool the refrigerant when the outdoor temps are high.
Be sure the condensor fins (outdoor) are clean & clear of debris. If you can't adequetly cool the refrigerant the internal pressures continue to rise, both on high side & low side until you trip the internal high temp cut-off switch.
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