2023 carrier airhandler Checked and tightened all electrical connections Changed Customer provided filter Drain was clear and draining Blower motor and wheel were acceptable Evaporator coil was acceptable Delta t was low 2023 carrier heatpump Checked and tightened all electrical connections Dual run capacitor was within manufacture range Primary electrical unit was acceptable Refrigerant levels were very low Washed Condenser coil from inside out Cleared debris out of unit Waxed top of unit Performed leak search of lineset and Evaporator coil due to low Refrigerant levels. Found leak on weld from previous company that installed the system. Customer is going to have that company come out and diagnose the system as it is still under warranty. Turned outdoor disconnect off to prevent damage to the compressor