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Hi, I am a retired hvac in Ohio. I'm in my 70's now and so much has changed. My sons friend was certified thru the US Air Force and installed a heat pump at my sons home about a year ago. he started having trouble with it this summer, not cooling good and sometimes freezing up inside and finally shutting down on low pressure. I checked it out and found a leak at the connection joint on the suction line outside. Also there was oil on the ground where the leak was. I'm wondering if that means that the e-coil and txv may now be damaged and may have to be replaced before i even start. So i know he can not afford to have anyone else to fix it, so. Thanks in advance for any advice or help.